MPEP § 2266.03 — Service of Papers (Annotated Rules)

§2266.03 Service of Papers

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

This page consolidates and annotates all enforceable requirements under MPEP § 2266.03, 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.

Service of Papers

This section addresses Service of Papers. Primary authority: 37 CFR 1.550. Contains: 2 requirements, 2 prohibitions, 2 guidance statements, 4 permissions, and 4 other statements.

Key Rules

Topic

PTAB Contested Case Procedures

4 rules
StatutoryProhibitedAlways
[mpep-2266-03-b204f08ea0d4b14b46d639eb]
Notice of Defective Paper Sent to Uncontactable Party
Note:
A Notice of Defective Paper (PTOL-475) is sent to an uncontactable party, giving them one month or thirty days to complete the paper and indicating the manner and date of service.

If the party making the submission cannot be contacted, a Notice of Defective Paper (PTOL-475), giving one month or thirty days, whichever is longer, to complete the paper, with a supplemental paper indicating the manner and date of service, will generally be mailed to the party.

Jump to MPEP Source · 37 CFR 1.550PTAB Contested Case ProceduresEx Parte Reexamination
StatutoryPermittedAlways
[mpep-2266-03-3cd5f8529b8b1798e994aefb]
Notice Required for Missing Service
Note:
If service of a submission is not made, the party that submitted must be notified and given at least one month to provide a copy.

If it is known that service of a submission was not made, notice of the requirement for service of copy may be given (to the party that made the submission), if appropriate, and a one month or thirty days, whichever is longer, time period is set. Form paragraph 22.15 may be used to give notice.

Jump to MPEP Source · 37 CFR 1.550PTAB Contested Case ProceduresEx Parte Reexamination
StatutoryInformativeAlways
[mpep-2266-03-81d923500558c1c850e30d72]
Initial Third Party Submission Requirement
Note:
The rule requires the submission of an initial third party request according to MPEP § 2220.

See MPEP § 2220 as to the initial third party request.

Jump to MPEP SourcePTAB Contested Case Procedures
StatutoryInformativeAlways
[mpep-2266-03-b03f50b87532b5d3f09c0c61]
Requirement for Third Party Reply
Note:
The rule requires that a third party reply must be provided in accordance with MPEP § 2251.

See MPEP § 2251 as to third party reply.

Jump to MPEP SourcePTAB Contested Case Procedures
Topic

Types of Office Actions

4 rules
StatutoryInformativeAlways
[mpep-2266-03-f20b5fc75add0064b2511021]
Responses to Office Actions Required
Note:
Patent owners must comply with the requirements set forth in Office actions.

See MPEP § 2266 as to patent owner responses to an Office action.

Jump to MPEP SourceTypes of Office ActionsExaminer's Action (37 CFR 1.104)Office Actions and Responses
MPEP GuidanceRecommendedAlways
[mpep-2266-03-031536825c723c68d3fdaefa]
Advisory Office Action Required for Missing Proof of Service
Note:
An advisory Office action (form PTOL-467 or PTOL-467A) must be issued if a response lacks proof of service, especially after a final rejection.

If the submission that lacks proof of service is a response to a final rejection, form PTOL-475 or form paragraph 22.15 should not be used. Rather, an advisory Office action (form PTOL-467 or PTOL-467A) should be issued with an explanation that the response lacks proof of service. The time period set in the final rejection continues to run and is extended by two months if the response is the first response after the final rejection in accordance with the guidelines set forth in MPEP § 2265. See also MPEP § 2272.

Jump to MPEP SourceTypes of Office ActionsForm ParagraphsRejection vs. Objection
MPEP GuidancePermittedAlways
[mpep-2266-03-8a851de99bf85b3f85b0d3cb]
Response to Office Action May Be Refused
Note:
A patent owner's response to an Office action may be refused consideration by the Office if it does not completely respond to the Office action.

The failure of a party to serve the submission in response to the notice will have the following consequences:

(B) For a patent owner response to an Office action, the response may be refused consideration by the Office.

Jump to MPEP SourceTypes of Office ActionsResponse to Office Action Requirements (37 CFR 1.111)Examination in Reexamination
MPEP GuidancePermittedAlways
[mpep-2266-03-ab05f6cc5c86da4728790fc6]
Patent Owner Must Fully Respond to Office Action
Note:
The patent owner must fully respond to the Office action for prosecution to continue, unless their response is refused consideration.

The failure of a party to serve the submission in response to the notice will have the following consequences:

Where consideration of a response is refused, the prosecution of the proceeding will be terminated in accordance with 37 CFR 1.550(d), unless the patent owner has otherwise completely responded to the Office action.

Jump to MPEP SourceTypes of Office ActionsResponse to Office Action Requirements (37 CFR 1.111)Examination in Reexamination
Topic

Ex Parte Reexamination

3 rules
StatutoryRequiredAlways
[mpep-2266-03-895ea056e8e646fdf637f5aa]
Proof of Service Requirement for Ex Parte Reexamination Papers
Note:
Papers filed without proof of service may be denied consideration in ex parte reexamination proceedings.

Any paper for which proof of service is required, which is filed without proof of service, may be denied consideration. Where no proof of service is included, the Central Reexamination Unit should immediately contact the party making the submission to see whether the indication of proof of service was inadvertently omitted from the submission but there was actual service.

Jump to MPEP Source · 37 CFR 1.550Ex Parte ReexaminationCentral Reexamination Unit ProcessingPTAB Contested Case Procedures
StatutoryRecommendedAlways
[mpep-2266-03-745b55108a779281dbd1cb00]
Manner and Date of Service Required for Ex Parte Reexamination
Note:
Parties must submit a supplemental paper detailing how and when service was made if it was indeed performed.

If service was in fact made, the party making the submission should be advised to submit a supplemental paper indicating the manner and date of service. The Central Reexamination Unit should enter the submission for consideration, and annotate the submission with:

Jump to MPEP Source · 37 CFR 1.550Ex Parte ReexaminationCentral Reexamination Unit ProcessingPTAB Contested Case Procedures
StatutoryPermittedAlways
[mpep-2266-03-c01c6b244c453ff2390146b6]
Notice for Service of Copy Required
Note:
A notice must be given if service of a submission was not made, and a one-month time period is set.

If it is known that service of a submission was not made, notice of the requirement for service of copy may be given (to the party that made the submission), if appropriate, and a one month or thirty days, whichever is longer, time period is set. Form paragraph 22.15 may be used to give notice.

Jump to MPEP Source · 37 CFR 1.550Ex Parte ReexaminationPTAB Contested Case Procedures
Topic

PTAB Jurisdiction

3 rules
StatutoryProhibitedAlways
[mpep-2266-03-87c55c33324f6b7d4bf6a55b]
Submission Without Proper Service Not Considered
Note:
If a submission is not properly served, it will be placed in the reexamination file and not considered unless service is later corrected.

If no service was made, or the party making the submission cannot be contacted where an effort to do so was made, the submission is placed in the reexamination file and normally is not considered. Where the submission is not considered because of a service defect, the submission is added to the IFW file history as an unentered paper with a “N/E” notation, along with a brief annotation as to why the paper is not entered. The submission itself shall be annotated with “no service,” which also can be crossed through if the appropriate service is later made.

Jump to MPEP Source · 37 CFR 1.550PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Reexamination
StatutoryInformativeAlways
[mpep-2266-03-e24a60f9644b01cf1040cf5e]
Submission Not Considered Due to Service Issue
Note:
If a submission is not considered due to a service defect, it is added to the IFW file history as an unentered paper with a 'N/E' notation and a brief annotation explaining why it was not entered.

If no service was made, or the party making the submission cannot be contacted where an effort to do so was made, the submission is placed in the reexamination file and normally is not considered. Where the submission is not considered because of a service defect, the submission is added to the IFW file history as an unentered paper with a “N/E” notation, along with a brief annotation as to why the paper is not entered. The submission itself shall be annotated with “no service,” which also can be crossed through if the appropriate service is later made.

Jump to MPEP Source · 37 CFR 1.550PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Reexamination
StatutoryRequiredAlways
[mpep-2266-03-33c02e6ae9a8a8c5390347b6]
Submission Must Be Annotated With No Service
Note:
Submissions not served properly must be marked with 'no service' and added to the IFW file history as unentered papers.

If no service was made, or the party making the submission cannot be contacted where an effort to do so was made, the submission is placed in the reexamination file and normally is not considered. Where the submission is not considered because of a service defect, the submission is added to the IFW file history as an unentered paper with a “N/E” notation, along with a brief annotation as to why the paper is not entered. The submission itself shall be annotated with “no service,” which also can be crossed through if the appropriate service is later made.

Jump to MPEP Source · 37 CFR 1.550PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Reexamination
Topic

Third Party Requester Rights

2 rules
StatutoryRequiredAlways
[mpep-2266-03-ffaafe7128652db504240c8f]
Papers Filed Must Be Served on All Parties
Note:
Any submission made in a third party requested reexamination must be served on every other party involved.

Any paper filed with the Office in a third party requested reexamination, i.e., any submission made by either the patent owner or the third party requester, must be served on every other party in the reexamination proceeding.

Jump to MPEP Source · 37 CFR 1.550Third Party Requester RightsInter Partes Reexamination RequestInter Partes Reexamination
StatutoryRequiredAlways
[mpep-2266-03-b99b2f34a301b0d1a145b0f5]
Submission Not Served In Third Party Reexamination
Note:
This rule applies when a required submission to the Office was not properly served in a third party requester reexamination proceeding.

1. This paragraph may be used where a submission to the Office was not served as required in a third party requester reexamination proceeding.

37 CFR 1.77Third Party Requester RightsInter Partes Reexamination RequestInter Partes Reexamination
Topic

Reexamination Certificate

2 rules
StatutoryRequiredAlways
[mpep-2266-03-349cbca8eb4dd9bcd38b8d47]
Certificate of Service Required for Ex Parte Reexamination
Note:
The party submitting a paper must attach a certificate of service with the name and address of the served party, method of service, and a copy of the certificate.

As proof of service, the party submitting the paper to the Office must attach a certificate of service to the paper. It is required that the name and address of the party served, and the method of service be set forth in the certificate of service. Further, a copy of the certificate of service must be attached with the copy of the paper that is served on the other party.

Jump to MPEP Source · 37 CFR 1.550Reexamination CertificateConclusion of Ex Parte ReexaminationEx Parte Reexamination
StatutoryRequiredAlways
[mpep-2266-03-61cfe9abbe12af00d95f0182]
Certificate of Service Must Be Attached
Note:
A copy of the certificate of service must be attached to the paper served on the other party.

As proof of service, the party submitting the paper to the Office must attach a certificate of service to the paper. It is required that the name and address of the party served, and the method of service be set forth in the certificate of service. Further, a copy of the certificate of service must be attached with the copy of the paper that is served on the other party.

Jump to MPEP Source · 37 CFR 1.550Reexamination CertificateConclusion of Ex Parte ReexaminationEx Parte Reexamination
Topic

Central Reexamination Unit Processing

2 rules
StatutoryRecommendedAlways
[mpep-2266-03-1cafdaa857b8fec7677df2d4]
Contact Party for Missing Proof of Service
Note:
The Central Reexamination Unit must contact the submitter if proof of service is missing but actual service was likely made.

Any paper for which proof of service is required, which is filed without proof of service, may be denied consideration. Where no proof of service is included, the Central Reexamination Unit should immediately contact the party making the submission to see whether the indication of proof of service was inadvertently omitted from the submission but there was actual service.

Jump to MPEP Source · 37 CFR 1.550Central Reexamination Unit ProcessingEx Parte ReexaminationPTAB Contested Case Procedures
StatutoryRecommendedAlways
[mpep-2266-03-1942b3ae643115dcf5ab92b3]
Central Reexamination Unit Must Consider Service of Papers
Note:
The Central Reexamination Unit should review and annotate submissions indicating service details if provided.

If service was in fact made, the party making the submission should be advised to submit a supplemental paper indicating the manner and date of service. The Central Reexamination Unit should enter the submission for consideration, and annotate the submission with:

Jump to MPEP Source · 37 CFR 1.550Central Reexamination Unit ProcessingEx Parte ReexaminationPTAB Contested Case Procedures
Topic

Final Office Action

2 rules
MPEP GuidanceRecommendedAlways
[mpep-2266-03-5497924c3e73b6f6f0d8a641]
Advisory Action Required for Missing Service Proof on Final Response
Note:
An advisory Office action (PTOL-467 or PTOL-467A) must be issued if a response to a final rejection lacks proof of service, instead of using form PTOL-475 or paragraph 22.15.

If the submission that lacks proof of service is a response to a final rejection, form PTOL-475 or form paragraph 22.15 should not be used. Rather, an advisory Office action (form PTOL-467 or PTOL-467A) should be issued with an explanation that the response lacks proof of service. The time period set in the final rejection continues to run and is extended by two months if the response is the first response after the final rejection in accordance with the guidelines set forth in MPEP § 2265. See also MPEP § 2272.

Jump to MPEP SourceFinal Office ActionForm Paragraph UsageForm Paragraphs
MPEP GuidanceInformativeAlways
[mpep-2266-03-f72ab8bc3e617396372ea4c7]
First Response After Final Rejection Extends Time Period
Note:
If the response to a final rejection is the first after it, the time period continues for two months as per MPEP §2265.

If the submission that lacks proof of service is a response to a final rejection, form PTOL-475 or form paragraph 22.15 should not be used. Rather, an advisory Office action (form PTOL-467 or PTOL-467A) should be issued with an explanation that the response lacks proof of service. The time period set in the final rejection continues to run and is extended by two months if the response is the first response after the final rejection in accordance with the guidelines set forth in MPEP § 2265. See also MPEP § 2272.

Jump to MPEP SourceFinal Office ActionRejection of ClaimsForm Paragraphs
Topic

Patent Owner Statement

1 rules
MPEP GuidancePermittedAlways
[mpep-2266-03-40f1dbc14419d575c5e3aebc]
Response Refusal for Patent Owner Statement
Note:
If a patent owner fails to submit a response, it may be refused consideration and the proceeding will terminate unless fully responded to.
The failure of a party to serve the submission in response to the notice will have the following consequences:
  • (A) For a patent owner statement or a third party reply, the submission may be refused consideration by the Office. Where consideration is refused, the submission will not be addressed in the reexamination proceeding other than to inform parties of the lack of consideration thereof;
  • (B) For a patent owner response to an Office action, the response may be refused consideration by the Office. Where consideration of a response is refused, the prosecution of the proceeding will be terminated in accordance with 37 CFR 1.550(d), unless the patent owner has otherwise completely responded to the Office action.
Jump to MPEP SourcePatent Owner StatementThird Party Requester ReplyEx Parte Reexamination

Examiner Form Paragraphs

Examiner form paragraphs are standard language that you might see in an Office Action or communication from the USPTO. Examiners have latitude to change the form paragraphs, but you will often see this exact language.

¶ 22.15 ¶ 22.15 Lack of Service – 37 CFR 1.550(f)

The submission filed on [1] is defective because it appears that the submission was not served on the [2] . After the filing of a request for reexamination by a third party requester, any document filed by either the patent owner or the third party requester must be served on the other party (or parties where two or more third party requester proceedings are merged) in the reexamination proceeding in the manner provided in 37 CFR 1.248 . See 37 CFR 1.550(f) .

It is required that service of the submission be made, and a certificate of service be provided to the Office within a shortened statutory period of ONE MONTH or THIRTY DAYS, whichever is longer, from the mailing date of this letter. If service of the submission is not timely made, the submission may be denied consideration.

Citations

Primary topicCitation
Patent Owner Statement
Types of Office Actions
37 CFR § 1.550(d)
PTAB Contested Case ProceduresMPEP § 2220
MPEP § 2249
PTAB Contested Case ProceduresMPEP § 2251
Final Office Action
Types of Office Actions
MPEP § 2265
Types of Office ActionsMPEP § 2266
Final Office Action
Types of Office Actions
MPEP § 2272
Ex Parte Reexamination
Final Office Action
PTAB Contested Case Procedures
Types of Office Actions
Form Paragraph § 22.15

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