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Manual of Patent Examining Procedure (MPEP)
Chapter 0500
Receipt and Handling of Mail and Papers
United States Patent and Trademark Office
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501
Filing Papers With the U.S. Patent and Trademark Office
502
Depositing Correspondence
503
Application Number and Filing Receipt
504
Assignment of Application for Examination
505
Date of Receipt Stamp
506
Completeness of Original Application
507
Drawing Review in the Office of Patent Application Processing
508
Distribution
509
Payment of Fees
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