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Title 37

Displaying title 37, up to date as of 8/10/2026. Title 37 was last amended 7/20/2026.
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  1. Title 37 —Patents, Trademarks, and Copyrights
  2. Chapter I —United States Patent and Trademark Office, Department of Commerce
  3. Subchapter A —General
  4. Part 1 —Rules of Practice in Patent Cases
  5. Subpart A   View Full Text
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eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

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Title 37Patents, Trademarks, and CopyrightsPart / Section
Chapter IUnited States Patent and Trademark Office, Department of Commerce1 – 199
Subchapter AGeneral1 – 90
Part 1Rules of Practice in Patent Cases1.1 – 1.1071
Subpart AGeneral Provisions1.1 – 1.29
General Information and Correspondence1.1 – 1.10
§ 1.1Addresses for non-trademark correspondence with the United States Patent and Trademark Office.
§ 1.2Business to be transacted in writing.
§ 1.3Business to be conducted with decorum and courtesy.
§ 1.4Nature of correspondence and signature requirements.
§ 1.5Identification of patent, patent application, or patent-related proceeding.
§ 1.6Receipt of correspondence.
§ 1.7Times for taking action; Expiration on Saturday, Sunday or Federal holiday.
§ 1.8Certificate of mailing or transmission.
§ 1.9Definitions.
§ 1.10Filing of correspondence by Priority Mail Express®.
Records and Files of the Patent and Trademark Office1.11 – 1.15
§ 1.11Files open to the public.
§ 1.12Assignment records open to public inspection.
§ 1.13Copies and certified copies.
§ 1.14Patent applications preserved in confidence.
§ 1.15 [Reserved]
Fees and Payment of Money1.16 – 1.29
§ 1.16National application filing, search, and examination fees.
§ 1.17Patent application and reexamination processing fees.
§ 1.18Patent post allowance (including issue) fees.
§ 1.19Document supply fees.
§ 1.20Post-issuance fees.
§ 1.21Miscellaneous fees and charges.
§ 1.22Fees payable in advance.
§ 1.23Methods of payment.
§ 1.24 [Reserved]
§ 1.25Deposit accounts.
§ 1.26Refunds.
§ 1.27Definition of small entities and establishing status as a small entity to permit payment of small entity fees; when a determination of entitlement to small entity status and notification of loss of entitlement to small entity status are required; fraud on the Office.
§ 1.28Refunds when small entity status is later established; how errors in small entity status are excused.
§ 1.29Micro entity status.
eCFR Content