MPEP § 501 — Filing Papers With the U.S. Patent and Trademark Office (Annotated Rules)

§501 Filing Papers With the U.S. Patent and Trademark Office

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 501, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Filing Papers With the U.S. Patent and Trademark Office

This section addresses Filing Papers With the U.S. Patent and Trademark Office. Primary authority: 37 CFR 1.6(a)(4), 37 CFR 1.1, and 37 CFR 1.4. Contains: 7 requirements, 6 guidance statements, and 4 other statements.

Key Rules

Topic

Testimony Request Procedures

16 rules
StatutoryInformativeAlways
[mpep-501-b3d761c1b536a0ee0e9acf32]
Correspondence Relating to Pending Litigation Must Be Addressed Specifically
Note:
All correspondence related to pending litigation must be addressed according to specific instructions provided in part 104 of this title.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. — (i) Litigation and service. Correspondence relating to pending litigation or otherwise within the scope of part 104 of this title shall be addressed as provided in § 104.2.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryRequiredAlways
[mpep-501-a99bdcc868b7d647c8a302af]
Correspondence Relating to Pending Litigation Must Be Addressed as Provided in §104.2
Note:
All correspondence related to pending litigation or within the scope of part 104 must be addressed according to the requirements specified in §104.2.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. — (i) Litigation and service. Correspondence relating to pending litigation or otherwise within the scope of part 104 of this title shall be addressed as provided in § 104.2.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-adffe5af1c0d8069617da84e]
Correspondence for Disciplinary Actions Must Be Directed to Specific Office
Note:
All correspondence regarding disciplinary proceedings must be addressed to the Office of the Solicitor at a specific PO box.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

(ii) Disciplinary proceedings.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryRequiredAlways
[mpep-501-f1c9a578a491f5bfcc75cfdc]
Correspondence to Counsel for Disciplinary Proceedings Must Be Mailed to Specific Address
Note:
All correspondence related to disciplinary proceedings must be addressed to Mail Stop 8, Office of the Solicitor, USPTO.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

Correspondence to counsel for the Director of the Office of Enrollment and Discipline relating to disciplinary proceedings pending before a Hearing Officer or the Director shall be mailed to: Mail Stop 8, Office of the Solicitor, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-18777ca39d9653513c6ad23d]
Correspondence to Office of the Solicitor Must Be Addressed Properly
Note:
All correspondence intended for the Office of the Solicitor must be addressed to Mail Stop 8, Office of the Solicitor, United States Patent and Trademark Office.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

(iii) Solicitor, in general.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryRequiredAlways
[mpep-501-62597692fb5b8f883ce713f0]
Correspondence to Office of the Solicitor Must Be Addressed Specifically
Note:
All correspondence intended for the Office of the Solicitor must be addressed to Mail Stop 8, Office of the Solicitor, USPTO.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

Correspondence to the Office of the Solicitor not otherwise provided for shall be addressed to: Mail Stop 8, Office of the Solicitor, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-5f7abf1ab900a4f535379b9a]
Correspondence to General Counsel Must Be Addressed Specifically
Note:
All correspondence to the Office of the General Counsel, not otherwise provided for, including disciplinary proceedings, must be addressed specifically to the General Counsel at a designated PO box.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

(iv) General Counsel.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryRequiredAlways
[mpep-501-37b69df30d8e5cac4c04bdfb]
Correspondence to General Counsel Must Be Addressed Specifically
Note:
All correspondence to the Office of the General Counsel, including disciplinary proceedings, must be sent to a specific address.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

Correspondence to the Office of the General Counsel not otherwise provided for, including correspondence to the General Counsel relating to disciplinary proceedings, shall be addressed to: General Counsel, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-bd03c53b43c6f47ca14f542d]
Correspondence Must Be Addressed Properly to USPTO
Note:
All correspondence intended for the USPTO must be addressed to specific offices and marked appropriately, except for electronic filings.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

(v) Improper correspondence.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryPermittedAlways
[mpep-501-a6d7f84017e2c17c8e10e052]
Correspondence to Post Office Box Will Be Returned
Note:
All correspondence addressed to a Post Office Box specified in the section will not be filed and may be returned by the United States Patent and Trademark Office.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(3) Office of General Counsel correspondence. —

Correspondence improperly addressed to a Post Office Box specified in paragraphs (a)(3)(i) and (a)(3)(ii) of this section will not be filed elsewhere in the United States Patent and Trademark Office, and may be returned.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Testimony Request ProceduresUSPTO Employee Testimony
StatutoryRecommendedAlways
[mpep-501-eebf0c75e1d562c3318e5beb]
Mark Correspondence for Reexamination and Supplemental Examination
Note:
All correspondence related to reexamination, inter partes reexamination, supplemental examination, or reexamination ordered from a supplemental proceeding must be marked with specific Mail Stop codes.
(c) For reexamination or supplemental examination proceedings.
  • (1) All correspondence concerning ex parte reexamination, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.04 of this chapter, should be additionally marked “Mail Stop Ex Parte Reexam.”
  • (2) All correspondence concerning inter partes reexamination, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.4 of this chapter, should be additionally marked ‘‘Mail Stop Inter Partes Reexam.’’
  • (3) Requests for supplemental examination (original and corrected request papers) and any other paper filed in a supplemental examination proceeding, should be additionally marked ‘‘Mail Stop Supplemental Examination.’’
  • (4) All correspondence concerning a reexamination proceeding ordered as a result of a supplemental reexamination proceeding, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.4 of this chapter should be additionally marked “Mail Stop Ex Parte Reexam.”
Jump to MPEP Source · 37 CFR 1.1Testimony Request ProceduresReexamination OrderUSPTO Employee Testimony
StatutoryRecommendedAlways
[mpep-501-d9aa1b9fb36ec1aa116fd805]
Correspondence for Ex Parte Reexamination Must Be Marked
Note:
All correspondence concerning ex parte reexamination, except for certain Office of the General Counsel communications, must be marked 'Mail Stop Ex Parte Reexam'.

(c) For reexamination or supplemental examination proceedings. (1) All correspondence concerning ex parte reexamination, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.04 of this chapter, should be additionally marked “Mail Stop Ex Parte Reexam.”

Jump to MPEP Source · 37 CFR 1.1Testimony Request ProceduresUSPTO Employee TestimonyEx Parte Reexamination
StatutoryRecommendedAlways
[mpep-501-8089483a713ad6fa5e3f7446]
Correspondence for Inter Partes Reexamination Must Be Marked
Note:
All correspondence related to inter partes reexamination, except for specific Office of the General Counsel communications, must be marked with 'Mail Stop Inter Partes Reexam'.

(c) For reexamination or supplemental examination proceedings.

(2) All correspondence concerning inter partes reexamination, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.4 of this chapter, should be additionally marked ‘‘Mail Stop Inter Partes Reexam.’’

Jump to MPEP Source · 37 CFR 1.1Testimony Request ProceduresUSPTO Employee TestimonyInter Partes Reexamination
StatutoryRecommendedAlways
[mpep-501-9e219fd9487fd6b6b8fb2cb6]
Correspondence for Reexamination Must Be Marked
Note:
All correspondence concerning a reexamination proceeding ordered as a result of a supplemental reexamination should be marked 'Mail Stop Ex Parte Reexam', except for correspondence to the Office of the General Counsel.

(c) For reexamination or supplemental examination proceedings.

(4) All correspondence concerning a reexamination proceeding ordered as a result of a supplemental reexamination proceeding, other than correspondence to the Office of the General Counsel pursuant to § 1.1(a)(3) and § 102.4 of this chapter should be additionally marked “Mail Stop Ex Parte Reexam.”

Jump to MPEP Source · 37 CFR 1.1Testimony Request ProceduresReexamination OrderUSPTO Employee Testimony
StatutoryRequiredAlways
[mpep-501-1e3b6c71fb90678422ad2023]
Correspondence Must Be Directed to OED Director
Note:
Correspondence related to disciplinary proceedings must be addressed to the Office of Enrollment and Discipline Director.
General Counsel United States Patent and Trademark Office P.O. Box 1450 Alexandria, VA 22313-1450
  • (B) Correspondence directed to the Office of Enrollment and Discipline (OED) Director relating to disciplinary proceedings pending before a Hearing Officer or the Director must be addressed:
Jump to MPEP Source · 37 CFR 2.190Testimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-1846a6c8db38f8ded1be3919]
Incorrect Area Address No Penalty
Note:
Documents addressed to the wrong area within the Office, except for those incorrectly sent to the General Counsel, will not incur a penalty as long as an approved address is used.

Pursuant to 37 CFR 1.1, non-trademark correspondence intended for the USPTO must be mailed to P.O. Box 1450, Alexandria, VA 22313-1450, except as otherwise provided. Except for certain mail addressed incorrectly to the Office of the General Counsel (see 37 CFR 1.1(a)(3)(v)), there will be no penalty for addressing a document to the wrong area within the Office, as long as one of the approved addresses is used. Use of the specific addresses listed within 37 CFR 1.1 is strongly encouraged because it will facilitate the process both for the Office and the filer. Accordingly, a new application incorrectly addressed to the Director will be treated the same as if the application was addressed to the specific Commissioner.

Jump to MPEP Source · 37 CFR 1.1Testimony Request ProceduresUSPTO Employee TestimonyPatent Examiner Testimony
Topic

Signature Requirements

7 rules
StatutoryRequiredAlways
[mpep-501-beb906b53303b69276cc8285]
Separate Copies for Each File
Note:
Each paper to be filed must have a separate copy for each file, even if the content is identical across files.

(b) Since each file must be complete in itself, a separate copy of every paper to be filed in a patent, patent file, or other proceeding must be furnished for each file to which the paper pertains, even though the contents of the papers filed in two or more files may be identical. The filing of duplicate copies of correspondence in the file of an application, patent, or other proceeding should be avoided, except in situations in which the Office requires the filing of duplicate copies. The Office may dispose of duplicate copies of correspondence in the file of an application, patent, or other proceeding.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryRecommendedAlways
[mpep-501-b038eef3e81e45c1ac792204]
Avoid Filing Duplicate Correspondence Except When Required
Note:
Filing duplicate copies of correspondence in an application, patent, or other proceeding should be avoided unless the Office specifically requires it.

(b) Since each file must be complete in itself, a separate copy of every paper to be filed in a patent, patent file, or other proceeding must be furnished for each file to which the paper pertains, even though the contents of the papers filed in two or more files may be identical. The filing of duplicate copies of correspondence in the file of an application, patent, or other proceeding should be avoided, except in situations in which the Office requires the filing of duplicate copies. The Office may dispose of duplicate copies of correspondence in the file of an application, patent, or other proceeding.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryPermittedAlways
[mpep-501-47ce0396c0168fc1e4a70c8c]
Office May Dispose of Duplicate Correspondence
Note:
The Office is permitted to dispose of duplicate copies of correspondence in the files of applications, patents, or other proceedings.

(b) Since each file must be complete in itself, a separate copy of every paper to be filed in a patent, patent file, or other proceeding must be furnished for each file to which the paper pertains, even though the contents of the papers filed in two or more files may be identical. The filing of duplicate copies of correspondence in the file of an application, patent, or other proceeding should be avoided, except in situations in which the Office requires the filing of duplicate copies. The Office may dispose of duplicate copies of correspondence in the file of an application, patent, or other proceeding.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryRequiredAlways
[mpep-501-f80c025b9b71987433e2c0f3]
Each Subject Must Be In Separate Paper
Note:
Each distinct subject, inquiry, or order must be contained in a separate paper to avoid confusion and delay.

(c) Since different matters may be considered by different branches or sections of the Office, each distinct subject, inquiry or order must be contained in a separate paper to avoid confusion and delay in answering papers dealing with different subjects. Subjects provided for on a single Office or World Intellectual Property Organization form may be contained in a single paper.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryPermittedAlways
[mpep-501-2ec9192dc6424d6ee1630c54]
Multiple Subjects Per Paper Prohibited
Note:
Each distinct subject must be contained in a separate paper to avoid confusion and delay.

(c) Since different matters may be considered by different branches or sections of the Office, each distinct subject, inquiry or order must be contained in a separate paper to avoid confusion and delay in answering papers dealing with different subjects. Subjects provided for on a single Office or World Intellectual Property Organization form may be contained in a single paper.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryRequiredAlways
[mpep-501-41044ebd5520ed99e4353fb3]
Certified Document Must Be Original, Not Copy
Note:
When a document required by statute to be certified must be filed, a copy including a photocopy or facsimile transmission of the certification is not acceptable.

(f) When a document that is required by statute to be certified must be filed, a copy, including a photocopy or facsimile transmission, of the certification is not acceptable.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
StatutoryPermittedAlways
[mpep-501-975ab325d977ab53a0f41a7b]
Office May Require Confirmation of Signature Authenticity
Note:
The Office may ask for confirmation, ratification, or evidence of a signature's authenticity if there are doubts about its veracity.

(h) Ratification/confirmation/evidence of authenticity: The Office may require ratification, confirmation (which includes submission of a duplicate document but with a proper signature), or evidence of authenticity of a signature, such as when the Office has reasonable doubt as to the authenticity (veracity) of the signature, e.g., where there are variations of a signature, or where the signature and the typed or printed name, do not clearly identify the person signing.

Jump to MPEP Source · 37 CFR 1.4Signature Requirements
Topic

PTAB Jurisdiction

4 rules
StatutoryInformativeAlways
[mpep-501-249e1a37bf05542f6ac03134]
Appeal Briefs Must Be Addressed to PTAB
Note:
All appeal briefs for patent appeals must be addressed to the Patent Trial and Appeal Board as specified in §41.10 or §42.6.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(1) Patent correspondence.

(ii) Patent Trial and Appeal Board. See § 41.10 or § 42.6 of this title.

Jump to MPEP Source · 37 CFR 1.6(a)(4)PTAB JurisdictionEx Parte Appeals to PTABPTAB Contested Case Procedures
StatutoryInformativeAlways
[mpep-501-f08bafda16fd5f54d865331b]
Electronically Filed Trademark Documents Must Use TEAS
Note:
Trademark documents filed electronically must be submitted through the Trademark Electronic Application System (TEAS).

(b) Electronic trademark documents. Trademark documents filed electronically must be submitted through TEAS. Documents that relate to proceedings before the Trademark Trial and Appeal Board must be filed electronically with the Board through ESTTA.

Jump to MPEP Source · 37 CFR 2.190PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
StatutoryRequiredAlways
[mpep-501-d24a094f1b03ee8485349807]
Trademark Documents Must Be Filed Electronically Through TEAS
Note:
Trademark documents must be submitted electronically through the Trademark Electronic Application System (TEAS) for filing with the U.S. Patent and Trademark Office.

(b) Electronic trademark documents. Trademark documents filed electronically must be submitted through TEAS. Documents that relate to proceedings before the Trademark Trial and Appeal Board must be filed electronically with the Board through ESTTA.

Jump to MPEP Source · 37 CFR 2.190PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
StatutoryRequiredAlways
[mpep-501-e1752bdaf7416fbd29839c98]
Documents for PTAB Must Be Filed Electronically Through ESTTA
Note:
Trademark documents related to proceedings before the Trademark Trial and Appeal Board must be submitted electronically via ESTTA.

(b) Electronic trademark documents. Trademark documents filed electronically must be submitted through TEAS. Documents that relate to proceedings before the Trademark Trial and Appeal Board must be filed electronically with the Board through ESTTA.

Jump to MPEP Source · 37 CFR 2.190PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
Topic

Post-Issuance & Maintenance Fees

4 rules
StatutoryInformativeAlways
[mpep-501-0876336a1f88490397b4014d]
Payment of Patent Maintenance Fees Must Be Addressed Electronically or to Specific PO Box
Note:
Patent maintenance fees must be paid electronically or sent to the Director of the United States Patent and Trademark Office at a specific P.O. Box address.

(d) Payments of maintenance fees. Payments of patent maintenance fees that are not submitted electronically and correspondence related to maintenance fees may be addressed to: Mail Stop Maintenance Fee, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 1.1Post-Issuance & Maintenance FeesMaintenance Fee AmountsFee Requirements
StatutoryPermittedAlways
[mpep-501-473fdfcb2d0fb48a7bda5a55]
Maintenance Fees Must Be Mailed to Specific PO Box
Note:
Patent maintenance fees and related correspondence must be mailed to Mail Stop Maintenance Fee, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

(d) Payments of maintenance fees. Payments of patent maintenance fees that are not submitted electronically and correspondence related to maintenance fees may be addressed to: Mail Stop Maintenance Fee, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 1.1Post-Issuance & Maintenance FeesMaintenance Fee AmountsFee Requirements
StatutoryPermittedAlways
[mpep-501-99ea0251daf0f08718ecda03]
Maintenance Fee Payments Must Be Mailed to Specific Address
Note:
The rule requires that maintenance fee payments not submitted electronically must be mailed to the specified address in Alexandria, Virginia.
Mail Stop 8 Office of the Solicitor United States Patent and Trademark Office P.O. Box 1450 Alexandria, Virginia 22313-1450
  • (C) Maintenance fee payments not electronically submitted over the Internet and correspondence related to maintenance fees may be addressed to:
Jump to MPEP Source · 37 CFR 2.190Post-Issuance & Maintenance FeesMaintenance Fee AmountsFee Requirements
StatutoryPermittedAlways
[mpep-501-d50f3e9a6472b02328a23560]
Payment to Replenish Deposit Account Required
Note:
A payment to replenish a deposit account for maintenance fees must be addressed to the Director of the United States Patent and Trademark Office at P.O. Box 1450, Alexandria, VA.
Mail Stop Maintenance Fee Director of the United States Patent and Trademark Office P.O. Box 1450 Alexandria, VA 22313-1450
  • (D) A payment to replenish a deposit account may be addressed to:
Jump to MPEP Source · 37 CFR 2.190Post-Issuance & Maintenance FeesMaintenance Fee AmountsFee Requirements
Topic

Official Gazette – Patents (MPEP 1730)

4 rules
StatutoryRecommendedAlways
[mpep-501-c41b729fe42e334ed6cc6a15]
Check Rules for Mailing Address
Note:
Persons filing correspondence with the Office must check the rules of practice, Official Gazette, or USPTO website to determine the appropriate mailing address.

Persons filing correspondence with the Office should check the rules of practice, the Official Gazette, or the USPTO website (www.uspto.gov) to determine the appropriate mailing address for such correspondence.

Jump to MPEP Source · 37 CFR 2.190Official Gazette – Patents (MPEP 1730)
StatutoryInformativeAlways
[mpep-501-b55e970f6aefb1bd5ce90675]
Special Mail Stops for Correspondence
Note:
Correspondence must be directed to specific mail stops within the Office for efficient processing.

Special mail stops have been established to allow the forwarding of particular types of correspondence to appropriate areas of the Office as quickly as possible. A list of these mail stops is published weekly in the Official Gazette. Only the specified type of document for a particular mail stop should be placed in an envelope addressed to that mail stop.

Jump to MPEP SourceOfficial Gazette – Patents (MPEP 1730)
StatutoryInformativeAlways
[mpep-501-62aafb7125268e23366ecd38]
List of Mail Stops Published Weekly
Note:
A weekly list of special mail stops for specific document types is published in the Official Gazette.

Special mail stops have been established to allow the forwarding of particular types of correspondence to appropriate areas of the Office as quickly as possible. A list of these mail stops is published weekly in the Official Gazette. Only the specified type of document for a particular mail stop should be placed in an envelope addressed to that mail stop.

Jump to MPEP SourceOfficial Gazette – Patents (MPEP 1730)
StatutoryRecommendedAlways
[mpep-501-7136b3f3b69db45a42cb6c63]
Correct Document for Mail Stop Required
Note:
Only the specified type of document for a particular mail stop should be placed in an envelope addressed to that mail stop.

Special mail stops have been established to allow the forwarding of particular types of correspondence to appropriate areas of the Office as quickly as possible. A list of these mail stops is published weekly in the Official Gazette. Only the specified type of document for a particular mail stop should be placed in an envelope addressed to that mail stop.

Jump to MPEP SourceOfficial Gazette – Patents (MPEP 1730)
Topic

Patent Term Extension

3 rules
StatutoryInformativeAlways
[mpep-501-26b9a1a07f2284ead10bdf29]
Extension of Patent Term Required for Filing
Note:
All patent term extension applications and related communications should be marked with specific mail stop and attention markings.

(e) Patent term extension. All applications for extension of patent term under 35 U.S.C. 156 and any communications relating thereto intended for the United States Patent and Trademark Office should be additionally marked “Mail Stop Hatch-Waxman PTE.” When appropriate, the communication should also be marked to the attention of a particular individual, as where a decision has been rendered.

Jump to MPEP Source · 37 CFR 1.1Patent Term ExtensionPatent Term BasicsPatent Term
StatutoryRecommendedAlways
[mpep-501-e99291809d44a101645d22df]
Mark Patent Term Extension Applications with Mail Stop Hatch-Waxman PTE
Note:
All applications for patent term extension and related communications should be marked with 'Mail Stop Hatch-Waxman PTE' to ensure proper processing by the USPTO.

(e) Patent term extension. All applications for extension of patent term under 35 U.S.C. 156 and any communications relating thereto intended for the United States Patent and Trademark Office should be additionally marked “Mail Stop Hatch-Waxman PTE.” When appropriate, the communication should also be marked to the attention of a particular individual, as where a decision has been rendered.

Jump to MPEP Source · 37 CFR 1.1Patent Term ExtensionPatent Term BasicsPatent Term
StatutoryRecommendedAlways
[mpep-501-275cd38ffc5cdcae42b34bda]
Communication Must Be Marked to Attention of Specific Individual When Appropriate
Note:
Communications for patent term extension applications should be marked with the attention of a specific individual when appropriate, as required by the U.S. Patent and Trademark Office.

(e) Patent term extension. All applications for extension of patent term under 35 U.S.C. 156 and any communications relating thereto intended for the United States Patent and Trademark Office should be additionally marked “Mail Stop Hatch-Waxman PTE.” When appropriate, the communication should also be marked to the attention of a particular individual, as where a decision has been rendered.

Jump to MPEP Source · 37 CFR 1.1Patent Term ExtensionPatent Term BasicsPatent Term
Topic

Patent Examiner Testimony

3 rules
StatutoryRequiredAlways
[mpep-501-649ad7915d7a4a8ef7fc5ed5]
Mail Non-Trademark Correspondence to USPTO PO Box
Note:
Non-trademark correspondence must be mailed to the specified P.O. Box in Alexandria, VA, unless otherwise directed.

Pursuant to 37 CFR 1.1, non-trademark correspondence intended for the USPTO must be mailed to P.O. Box 1450, Alexandria, VA 22313-1450, except as otherwise provided. Except for certain mail addressed incorrectly to the Office of the General Counsel (see 37 CFR 1.1(a)(3)(v)), there will be no penalty for addressing a document to the wrong area within the Office, as long as one of the approved addresses is used. Use of the specific addresses listed within 37 CFR 1.1 is strongly encouraged because it will facilitate the process both for the Office and the filer. Accordingly, a new application incorrectly addressed to the Director will be treated the same as if the application was addressed to the specific Commissioner.

Jump to MPEP Source · 37 CFR 1.1Patent Examiner TestimonyTestimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-02070d26cf93a26bcf506e12]
Use of Approved Addresses for Filings
Note:
Filers are encouraged to use the specific addresses listed in 37 CFR 1.1 to facilitate the process for both the Office and filers.

Pursuant to 37 CFR 1.1, non-trademark correspondence intended for the USPTO must be mailed to P.O. Box 1450, Alexandria, VA 22313-1450, except as otherwise provided. Except for certain mail addressed incorrectly to the Office of the General Counsel (see 37 CFR 1.1(a)(3)(v)), there will be no penalty for addressing a document to the wrong area within the Office, as long as one of the approved addresses is used. Use of the specific addresses listed within 37 CFR 1.1 is strongly encouraged because it will facilitate the process both for the Office and the filer. Accordingly, a new application incorrectly addressed to the Director will be treated the same as if the application was addressed to the specific Commissioner.

Jump to MPEP Source · 37 CFR 1.1Patent Examiner TestimonyTestimony Request ProceduresUSPTO Employee Testimony
StatutoryInformativeAlways
[mpep-501-69c6f50dea0d6c4e1b3ce7a9]
Application Addressed to Director Treated as Commissioner
Note:
An application incorrectly addressed to the Director will be treated as if it was addressed to the specific Commissioner.

Pursuant to 37 CFR 1.1, non-trademark correspondence intended for the USPTO must be mailed to P.O. Box 1450, Alexandria, VA 22313-1450, except as otherwise provided. Except for certain mail addressed incorrectly to the Office of the General Counsel (see 37 CFR 1.1(a)(3)(v)), there will be no penalty for addressing a document to the wrong area within the Office, as long as one of the approved addresses is used. Use of the specific addresses listed within 37 CFR 1.1 is strongly encouraged because it will facilitate the process both for the Office and the filer. Accordingly, a new application incorrectly addressed to the Director will be treated the same as if the application was addressed to the specific Commissioner.

Jump to MPEP Source · 37 CFR 1.1Patent Examiner TestimonyTestimony Request ProceduresUSPTO Employee Testimony
Topic

Oral Hearing

2 rules
StatutoryRequiredAlways
[mpep-501-b8b38fa9b6be3004b77d9bca]
Proper Address for USPTO Correspondence
Note:
All correspondence to the USPTO must be addressed to specific PO boxes, except electronic filings. Include attention marks when appropriate.
(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
  • (1) Patent correspondence.
    • (i) In general. All correspondence concerning patent matters processed by organizations reporting to the Commissioner for Patents should be addressed to: Commissioner for Patents, P.O. Box 1450, Alexandria, Virginia 22313-1450.
    • (ii) Patent Trial and Appeal Board. See § 41.10 or § 42.6 of this title. Notices of appeal, appeal briefs, reply briefs, requests for oral hearing, as well as all other correspondence in an application or a patent involved in an appeal to the Board for which an address is not otherwise specified, should be addressed as set out in paragraph (a)(1)(i) of this section.
  • (2) [Reserved]
  • (3) Office of General Counsel correspondence. —
    • (i) Litigation and service. Correspondence relating to pending litigation or otherwise within the scope of part 104 of this title shall be addressed as provided in § 104.2.
    • (ii) Disciplinary proceedings. Correspondence to counsel for the Director of the Office of Enrollment and Discipline relating to disciplinary proceedings pending before a Hearing Officer or the Director shall be mailed to: Mail Stop 8, Office of the Solicitor, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
    • (iii) Solicitor, in general. Correspondence to the Office of the Solicitor not otherwise provided for shall be addressed to: Mail Stop 8, Office of the Solicitor, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
    • (iv) General Counsel. Correspondence to the Office of the General Counsel not otherwise provided for, including correspondence to the General Counsel relating to disciplinary proceedings, shall be addressed to: General Counsel, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
    • (v) Improper correspondence. Correspondence improperly addressed to a Post Office Box specified in paragraphs (a)(3)(i) and (a)(3)(ii) of this section will not be filed elsewhere in the United States Patent and Trademark Office, and may be returned.
  • (4) Office of Public Records correspondence.
    • (i) Assignments. All patent-related documents submitted by mail to be recorded by Assignment Services Division, except for documents filed together with a new application, should be addressed to: Mail Stop Assignment Recordation Services, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450. See § 3.27.
    • (ii) Documents. All requests for certified or uncertified copies of patent documents should be addressed to: Mail Stop Document Services, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
  • (5) Office of Enrollment and Discipline correspondence. All correspondence directed to the Office of Enrollment and Discipline concerning enrollment, registration, and investigation matters should be addressed to Mail Stop OED, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
Jump to MPEP Source · 37 CFR 1.6(a)(4)Oral HearingTestimony Request ProceduresPTAB Jurisdiction
StatutoryRecommendedAlways
[mpep-501-4f5b3f6351fffb789e2bdfb4]
Appeal Correspondence Must Be Addressed to Board
Note:
All appeal-related correspondence, including notices of appeal and briefs, must be addressed to the Patent Trial and Appeal Board as specified.

(a) In general. Except for correspondence submitted via the U.S. Patent and Trademark Office (USPTO) patent electronic filing system in accordance with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to either “Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450” or to specific areas within the Office provided in this section. When appropriate, correspondence should also be marked for the attention of a particular office or individual.
(1) Patent correspondence.

Notices of appeal, appeal briefs, reply briefs, requests for oral hearing, as well as all other correspondence in an application or a patent involved in an appeal to the Board for which an address is not otherwise specified, should be addressed as set out in paragraph (a)(1)(i) of this section.

Jump to MPEP Source · 37 CFR 1.6(a)(4)Oral HearingPTAB JurisdictionEx Parte Appeals to PTAB
Topic

Patent Cooperation Treaty

2 rules
StatutoryInformativeAlways
[mpep-501-32ef4432445f231c343398e6]
Letters Relating to PCT Must Be Marked Mail Stop PCT
Note:
Letters and other communications related to international patent applications during the international stage should be marked ‘Mail Stop PCT’.

(b) Patent Cooperation Treaty. Letters and other communications relating to international applications during the international stage and prior to the assignment of a national serial number should be additionally marked “Mail Stop PCT.”

Jump to MPEP Source · 37 CFR 1.1Patent Cooperation Treaty
StatutoryRecommendedAlways
[mpep-501-9fae8698ebe7d56c9170fb62]
PCT Communications Must Be Marked Mail Stop PCT
Note:
Letters and other communications related to international applications during the international stage must be marked 'Mail Stop PCT' before a national serial number is assigned.

(b) Patent Cooperation Treaty. Letters and other communications relating to international applications during the international stage and prior to the assignment of a national serial number should be additionally marked “Mail Stop PCT.”

Jump to MPEP Source · 37 CFR 1.1Patent Cooperation Treaty
Topic

Certified Copies of Documents

2 rules
StatutoryInformativeAlways
[mpep-501-f37df6705722e6706840102b]
Requests for Certified Trademark Documents Must Be Addressed to Specific PO Box
Note:
Paper requests for certified copies of trademark documents must be sent to a specific address in Alexandria, Virginia.

(d) Requests for certified copies of trademark documents. Paper requests for certified copies of trademark documents must be addressed to: Mail Stop Document Services, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 2.190Certified Copies of Documents
StatutoryRequiredAlways
[mpep-501-7826ca4f9980b5686e0f569d]
Requests for Certified Copies of Trademark Documents Must Be Addressed to Specific PO Box
Note:
Paper requests for certified copies of trademark documents must be sent to Mail Stop Document Services, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

(d) Requests for certified copies of trademark documents. Paper requests for certified copies of trademark documents must be addressed to: Mail Stop Document Services, Director of the United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.

Jump to MPEP Source · 37 CFR 2.190Certified Copies of Documents
Topic

Supplemental Examination

1 rules
StatutoryRecommendedAlways
[mpep-501-59af6a7c1ae9d62f5988ed23]
Requests for Supplemental Examination Must Be Marked
Note:
All papers filed in a supplemental examination proceeding must be additionally marked ‘Mail Stop Supplemental Examination’.

(c) For reexamination or supplemental examination proceedings.

(3) Requests for supplemental examination (original and corrected request papers) and any other paper filed in a supplemental examination proceeding, should be additionally marked ‘‘Mail Stop Supplemental Examination.’’

Jump to MPEP Source · 37 CFR 1.1Supplemental Examination
Topic

Correspondence Address

1 rules
StatutoryInformativeAlways
[mpep-501-44d519d066a8e3ad93217a8f]
Correspondence with Patent Office Required for Applications and Proceedings
Note:
This rule outlines the types of correspondence required when interacting with the U.S. Patent and Trademark Office, including general inquiries and communications related to specific applications or proceedings.
(a) Correspondence with the Patent and Trademark Office comprises:
  • (1) Correspondence relating to services and facilities of the Office, such as general inquiries, requests for publications supplied by the Office, orders for printed copies of patents, orders for copies of records, transmission of assignments for recording, and the like, and
  • (2) Correspondence in and relating to a particular application or other proceeding in the Office. See particularly the rules relating to the filing, processing, or other proceedings of national applications in subpart B of this part; of international applications in subpart C of this part; of ex parte reexaminations of patents in subpart D of this part; of supplemental examination of patents in subpart E of this part; of extension of patent term in subpart F of this part; of inter partes reexaminations of patents in subpart H of this part; of international design applications in subpart I of this part; and of the Patent Trial and Appeal Board in parts 41 and 42 of this chapter.
Jump to MPEP Source · 37 CFR 1.4Correspondence AddressInternational Design Application RequirementsStatutory Authority for Examination
Topic

Practitioner Recognition and Conduct

1 rules
StatutoryRequiredAlways
[mpep-501-63f2e5a5e5ba5ca9018a7d1a]
Disclosure of Assistance Received During Patent Application Preparation
Note:
An applicant must disclose if they received assistance in preparing the patent application, including any compensation paid, and provide the names of those who provided such assistance.

(g) An applicant who has not made of record a registered attorney or agent may be required to state whether assistance was received in the preparation or prosecution of the patent application, for which any compensation or consideration was given or charged, and if so, to disclose the name or names of the person or persons providing such assistance. Assistance includes the preparation for the applicant of the specification and amendments or other papers to be filed in the Patent and Trademark Office, as well as other assistance in such matters, but does not include merely making drawings by draftsmen or stenographic services in typing papers.

Jump to MPEP Source · 37 CFR 1.4Practitioner Recognition and ConductSignature RequirementsPatent Application Content
Topic

Patent Application Content

1 rules
StatutoryInformativeAlways
[mpep-501-c3d5f6d63847ad080d565a0c]
Disclosure of Assistance in Patent Application Preparation Required
Note:
Applicants must disclose if they received assistance in preparing the patent application, including writing specifications and amendments, but not including drawing preparation or typing services.

(g) An applicant who has not made of record a registered attorney or agent may be required to state whether assistance was received in the preparation or prosecution of the patent application, for which any compensation or consideration was given or charged, and if so, to disclose the name or names of the person or persons providing such assistance. Assistance includes the preparation for the applicant of the specification and amendments or other papers to be filed in the Patent and Trademark Office, as well as other assistance in such matters, but does not include merely making drawings by draftsmen or stenographic services in typing papers.

Jump to MPEP Source · 37 CFR 1.4Patent Application ContentSignature RequirementsPractitioner Recognition and Conduct
Topic

Express Abandonment to Avoid Publication

1 rules
StatutoryRequiredAlways
[mpep-501-c486bdfd8a8555b1cb4f400d]
Petitions and Requests Requiring Prompt Action
Note:
Certain patent-related petitions and requests, such as express abandonment to avoid publication and expedited examination, must be addressed immediately.
Certain patent-related correspondence requires immediate Office attention. Examples are:
  • (A) Petitions for express abandonment to avoid publication under 37 CFR 1.138(c);
  • (B) Petitions to withdraw an application from issue under 37 CFR 1.313(c);
  • (C) Petitions to defer issuance of patent under 37 CFR 1.314;
  • (D) Request for expedited examination of a design application (rocket docket); and
  • (E) Certain papers required by the Office of Data Management.
Jump to MPEP Source · 37 CFR 2.190Express Abandonment to Avoid PublicationAbandonment & PublicationExpress Abandonment

Citations

Primary topicCitation
Patent Term Extension35 U.S.C. § 156
Patent Examiner Testimony
Testimony Request Procedures
37 CFR § 1.1
Testimony Request Procedures37 CFR § 1.1(a)(3)
Patent Examiner Testimony
Testimony Request Procedures
37 CFR § 1.1(a)(3)(v)
Express Abandonment to Avoid Publication37 CFR § 1.138(c)
Express Abandonment to Avoid Publication37 CFR § 1.313(c)
Express Abandonment to Avoid Publication37 CFR § 1.314
37 CFR § 1.4(c)
Oral Hearing
PTAB Jurisdiction
Testimony Request Procedures
37 CFR § 1.6(a)(4)
Testimony Request Procedures37 CFR § 102.04
Testimony Request Procedures37 CFR § 102.4
Oral Hearing
Testimony Request Procedures
37 CFR § 104.2
37 CFR § 2.190
37 CFR § 2.190(e)
Oral Hearing37 CFR § 3.27
Oral Hearing
PTAB Jurisdiction
37 CFR § 41.10
Oral Hearing
PTAB Jurisdiction
37 CFR § 42.6
37 CFR § 7.11
37 CFR § 7.14
37 CFR § 7.21
37 CFR § 7.23
37 CFR § 7.24
37 CFR § 7.28
37 CFR § 7.31
MPEP § 502
MPEP § 502.01
MPEP § 502.05

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2025-12-31