MPEP § 2756 — Correspondence Between the USPTO and the Regulatory Agency (Annotated Rules)

§2756 Correspondence Between the USPTO and the Regulatory Agency

USPTO MPEP version: BlueIron's Update: 2026-01-17

This page consolidates and annotates all enforceable requirements under MPEP § 2756, 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.

Correspondence Between the USPTO and the Regulatory Agency

This section addresses Correspondence Between the USPTO and the Regulatory Agency. Primary authority: 35 U.S.C. 156. Contains: 1 requirement, 3 permissions, and 7 other statements.

Key Rules

Topic

PTE Calculation

11 rules
StatutoryInformativeAlways
[mpep-2756-24b2df58be3906f915f205f9]
Cooperation Agreement for Patent Term Extension Determinations
Note:
The Food and Drug Administration and the Department of Agriculture must cooperate with the Office to determine patent term extension eligibility under 35 U.S.C. 156.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourcePTE CalculationProducts Eligible for PTEPatent Term Extension
StatutoryInformativeAlways
[mpep-2756-46588ebeee157c58ffb766d4]
Procedures for Exchanging Information Between Agencies
Note:
Establishes procedures for exchanging information between regulatory agencies and the Office regarding patent term extension determinations, due diligence petitions, and informal hearings.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourcePTE CalculationPatent Term ExtensionProducts Eligible for PTE
StatutoryInformativeAlways
[mpep-2756-fc27a47de4ebcada610b8a58]
USDA Service Reviews Veterinary Biological Products and Patent Extensions
Note:
The Animal and Plant Health Inspection Service of the USDA is responsible for reviewing veterinary biological products and assisting in determining patent term extensions under the Virus-Serum-Toxin Act.

The Animal and Plant Health Inspection Service of the United States Department of Agriculture approves veterinary biological products and is responsible for both (i) assisting the Office in determining the eligibility for term extension of a patent which claims a veterinary biological product that has been subject to review under the Virus-Serum-Toxin Act (21 U.S.C. 151-59) and (ii) determining the regulatory review period of the veterinary biological product. The Secretary of Health and Human Services of the Food and Drug Administration is responsible for assisting the Office in determining the eligibility of patents for patent term extension which claim any other product for which regulatory review is required and for determining the regulatory review period for such products. 21 CFR 60.10.

Jump to MPEP SourcePTE CalculationPatent Term ExtensionProducts Eligible for PTE
StatutoryRequiredAlways
[mpep-2756-8401e4be2aa031c6362afc3b]
Secretary of Health and Human Services Determines PTE Eligibility
Note:
The Secretary is responsible for assessing patent eligibility for term extension and determining the regulatory review period for products requiring such review.

The Animal and Plant Health Inspection Service of the United States Department of Agriculture approves veterinary biological products and is responsible for both (i) assisting the Office in determining the eligibility for term extension of a patent which claims a veterinary biological product that has been subject to review under the Virus-Serum-Toxin Act (21 U.S.C. 151-59) and (ii) determining the regulatory review period of the veterinary biological product. The Secretary of Health and Human Services of the Food and Drug Administration is responsible for assisting the Office in determining the eligibility of patents for patent term extension which claim any other product for which regulatory review is required and for determining the regulatory review period for such products. 21 CFR 60.10.

Jump to MPEP SourcePTE CalculationProducts Eligible for PTEPatent Term Extension
StatutoryInformativeAlways
[mpep-2756-dd8447a80fa7aa78820b036f]
Regulatory Review Period Determination for Veterinary Biological Products
Note:
The Animal and Plant Health Inspection Service determines the regulatory review period for veterinary biological products, while the Secretary of Health and Human Services handles other product types.

The Animal and Plant Health Inspection Service of the United States Department of Agriculture approves veterinary biological products and is responsible for both (i) assisting the Office in determining the eligibility for term extension of a patent which claims a veterinary biological product that has been subject to review under the Virus-Serum-Toxin Act (21 U.S.C. 151-59) and (ii) determining the regulatory review period of the veterinary biological product. The Secretary of Health and Human Services of the Food and Drug Administration is responsible for assisting the Office in determining the eligibility of patents for patent term extension which claim any other product for which regulatory review is required and for determining the regulatory review period for such products. 21 CFR 60.10.

Jump to MPEP SourcePTE CalculationProducts Eligible for PTEPatent Term Extension
StatutoryPermittedAlways
[mpep-2756-0dd82bd62ed5951a47fd6c08]
Regulatory Agency Reply for PTE Calculation
Note:
The regulatory agency must provide a written response verifying product review, marketing permission status, patent term extension application timing, and other relevant information for PTE calculation.
The regulatory agency reply is usually in the form of a written response:
  • (A) verifying whether the product has undergone a regulatory review period within the meaning of 35 U.S.C. 156(g) prior to commercial marketing or use;
  • (B) stating whether the marketing permission was for the first permitted commercial marketing or use of that product, or, in the case of recombinant DNA technology, whether such commercial marketing or use was the first permitted under the process claimed in the patent;
  • (C) informing the Office whether the patent term extension application was submitted within sixty days after the product was approved for marketing or use; and
  • (D) providing the Office with any other information relevant to the determination of whether a patent related to a product is eligible for patent term extension.
Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePTE Eligibility Requirements
StatutoryInformativeAlways
[mpep-2756-b366982aa2338d78e48be54c]
Compare Regulatory Agency Info with Application
Note:
The Office compares the information provided by the regulatory agency with the related information from the application to determine if a patent is eligible for an extension of its term.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePTE Eligibility Requirements
StatutoryInformativeAlways
[mpep-2756-f91625ced14fd4c5a27dca10]
Request for Regulatory Review Period After Eligibility Determination
Note:
Send a second letter to the regulatory agency requesting the length of the product's regulatory review period if no major discrepancies are found and the patent is determined eligible for term extension within 60 days of receiving the regulatory agency's reply.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePTE Eligibility Requirements
StatutoryInformativeAlways
[mpep-2756-f136ff6753dcd193d238e5d4]
Ineligible Patent Term Extension Dismisses Application
Note:
If a patent is determined ineligible for term extension, the Office will dismiss the application rather than request a regulatory review period determination.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePatent Term Extension
StatutoryInformativeAlways
[mpep-2756-5f96be80713bb52a3ccee58d]
Preliminary Eligibility Decision for Patent Term Extension
Note:
The Office makes a preliminary decision on whether a patent is eligible for an extension of its term based on the regulatory agency's response to the first letter requesting assistance.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePTE Eligibility Requirements
StatutoryInformativeAlways
[mpep-2756-a82c7d3d2e44a14684aed318]
Request for Regulatory Review Period Determination After Eligibility
Note:
The Office requests a determination of the applicable regulatory review period after determining a patent is eligible for term extension based on the regulatory agency's approval information.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE CalculationPTE Determination ProcedurePTE Eligibility Requirements
Topic

Patent Term Extension

3 rules
StatutoryInformativeAlways
[mpep-2756-08ba744f5d239615c9c1588c]
Director Decides Patent Term Extension Eligibility
Note:
The Director must determine if an applicant meets the statutory requirements and if a patent qualifies for term extension.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourcePatent Term ExtensionPatent TermPTE Calculation
StatutoryInformativeAlways
[mpep-2756-237165124e83634a0bf0d5cf]
Regulatory Agency Assistance for Patent Term Extension Determinations
Note:
The agreements establish procedures where the regulatory agency assists the Office in determining a patent’s eligibility for extension under 35 U.S.C. 156.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourcePatent Term ExtensionPatent TermPTE Calculation
StatutoryInformativeAlways
[mpep-2756-6d0d98a162ab7f69859a3b7a]
Patent Term Extension Applicant Receives Office-Regulatory Agency Correspondence
Note:
The patent term extension applicant must receive a copy of all communications between the USPTO and the regulatory agency to facilitate eligibility decisions.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourcePatent Term ExtensionPatent TermPTE Calculation
Topic

PTE Determination Procedure

3 rules
StatutoryPermittedAlways
[mpep-2756-242cacbdc9e6e8c1614b05b0]
Provide Relevant Information for PTE Eligibility
Note:
The regulatory agency must provide the Office with any additional information necessary to determine if a patent is eligible for patent term extension.

The regulatory agency reply is usually in the form of a written response:

(D) providing the Office with any other information relevant to the determination of whether a patent related to a product is eligible for patent term extension.

Jump to MPEP SourcePTE Determination ProcedurePTE Eligibility RequirementsPatent Term Extension
StatutoryInformativeAlways
[mpep-2756-64b5999b6c2d6a35816d0245]
Preliminary Eligibility for Patent Term Extension Determined After Agency Reply
Note:
A preliminary decision is made on whether a patent qualifies for an extension after receiving the regulatory agency's response to the Office's first request for assistance in determining eligibility.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE Determination ProcedurePTE Eligibility RequirementsPatent Eligibility
StatutoryInformativeAlways
[mpep-2756-279a825257b31631b6598646]
Regulatory Agency Reply Determines PTE Eligibility
Note:
The reply from the regulatory agency determines if a patent is eligible for term extension based on first approval and filing within 60 days.

Upon receipt of a reply from the regulatory agency to the first letter from the Office requesting assistance on determining eligibility, a preliminary eligibility decision (not the final decision) is made as to whether the patent is eligible for an extension of its term. As noted above, the reply from the regulatory agency will usually inform the Office as to whether the permission for commercial marketing or use of the product on which the application for patent term extension is based is the first such approval for that product. Furthermore, the regulatory agency usually provides information regarding the date of product approval to permit a determination as to whether the application was filed within the sixty-day statutory period set forth in 35 U.S.C. 156(d)(1). The information provided by the regulatory agency is then compared with the related information from the application. If no major discrepancies are found and the patent is determined to be eligible for patent term extension, a second letter requesting a determination of the length of the regulatory review period of the product is sent to the regulatory agency not later than sixty (60) days after the Office receipt date of the reply from the regulatory agency. In the interest of efficiency, if the patent is determined to be ineligible for patent term extension, the Office will dismiss the application rather than request a determination of the regulatory review period. In re Allen & Hansbury, Ltd., 227 USPQ 955, 960 n. 9 (Comm’r Pat. & Tm. 1985). The second letter states that, subject to final review, the patent is considered eligible for patent term extension and requests a determination of the applicable regulatory review period.

Jump to MPEP SourcePTE Determination ProcedurePatent Term ExtensionStatutory Period Computation (37 CFR 1.134)
Topic

Products Eligible for PTE

1 rules
StatutoryPermittedAlways
[mpep-2756-0ab9774f694b7a907d280d25]
Cooperation Agreement Between USPTO and Regulatory Agencies for Patent Term Extension
Note:
The agreement establishes procedures for the Office to seek assistance from regulatory agencies in determining patent eligibility for term extension under 35 U.S.C. 156.

It is the Director’s responsibility to decide whether an applicant has satisfied the requirements of the statute and whether the patent qualifies for patent term extension. The regulatory agency possesses expertise and records regarding some of the statutory requirements and has certain direct responsibilities under 35 U.S.C. 156 for determining the length of the regulatory review period. Consequently, to facilitate eligibility decisions and permit the regulatory agency and the Office to carry out their responsibilities under 35 U.S.C. 156, both the Food and Drug Administration and the Department of Agriculture have entered into an “agreement” of cooperation with the Office. Memorandum of Understanding Between the Patent and Trademark Office and the Food and Drug Administration, 52 FR 17830 (May 12, 1987); Memorandum of Understanding Between the Patent and Trademark Office and the Animal and Plant Health Inspection Service, 54 FR 26399 (June 23, 1989); 1104 OG 18 (July 11, 1989). The agreements establish the procedures whereby the regulatory agency assists the Office in determining a patent’s eligibility for patent term extension under 35 U.S.C. 156. They also establish procedures for exchanging information between the regulatory agency and the Office regarding regulatory review period determinations, due diligence petitions and informal regulatory agency hearings under the law. The patent term extension applicant receives a copy of all correspondence between the Office and the regulatory agency.

Jump to MPEP SourceProducts Eligible for PTEPTE CalculationPatent Term Extension

Citations

Primary topicCitation
PTE Calculation
Patent Term Extension
Products Eligible for PTE
35 U.S.C. § 156
PTE Calculation
PTE Determination Procedure
35 U.S.C. § 156(d)(1)
PTE Calculation35 U.S.C. § 156(g)

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: 2026-01-17