Manual of Patent Examining Procedure (MPEP)
Chapter 500: Receipt and Handling of Mail and Papers

Ninth Edition of the MPEP, Revision 08.2017, Last Revised in January 2018

Chapter 500: Receipt and Handling of Mail and Papers

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

502: Depositing Correspondence

502.01: Correspondence Transmitted by Facsimile

502.02: Correspondence Signature Requirements

502.03: Communications via Internet Electronic Mail (email)

502.04: Duplicate Copies of Correspondence

502.05: Correspondence Transmitted by EFS-Web

503: Application Number and Filing Receipt

504: Assignment of Application for Examination

505: Date of Receipt Stamp

506: Completeness of Original Application

506.01: [Reserved]

506.02: Review of Refusal To Accord Filing Date

507: Drawing Review in the Office of Patent Application Processing

508: Distribution

508.01: [Reserved]

508.02: Papers Received After Patenting or Abandonment

508.03: [Reserved]

508.04: Unlocatable Patent or Application Files

509: Payment of Fees

509.01: Deposit Accounts

509.02: Small Entity Status — Definitions

509.03: Claiming Small Entity Status

509.04: Micro Entity Status — Definitions

509.04(a): Gross Income Basis for Micro Entity Status

509.04(b): Institution of Higher Education Basis for Micro Entity Status

509.04(c): Parties Who Can Sign the Micro Entity Certification

509.04(d): Continued Obligation to Determine Micro Entity Qualification

509.04(e): Notification of Loss of Entitlement to Micro Entity Status

509.04(f): Correcting Errors in Micro Entity Status

510: U.S. Patent and Trademark Office Business Hours

511: Postal Service Interruptions and Emergencies

512: Certificate of Mailing or Transmission

513: Deposit as Priority Mail Express® with U.S. Postal Service