What is the date of receipt stamp for USPTO correspondence?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-09 10 Rules 5 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. The United States Patent and Trademark Office (USPTO) stamps correspondence received with the date of receipt, known as the ‘Office Date’ stamp. This applies to papers and fees received through various methods: Mail (except Priority Mail Express®) Facsimile EFS-Web Hand-carried to the Customer Service Window As stated in the MPEP: The United States Patent and Trademark Office (Office) stamps papers and fees received through the mail (other than those submitted by Priority Mail Express® in accordance with 37 CFR 1.10), by facsimile, or via EFS-Web with the date of their receipt in the Office. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Priority Mail Express Stamp for Filing MPEP 505 Permitted Office Date Stamp Required for Receipt of Correspondence MPEP 505 Priority Mail Express Date for Patent Office Receipt MPEP 505 Permitted Office Date Stamp Establishes Filing Date for Complete Applications MPEP 505 Patent and Trademark Office Not Open on Weekends and Holidays MPEP 505 Permitted Office Date Stamping for Mail and Electronic Filings MPEP 505 Hand-Carried Papers Must Be Date Stamped MPEP 505 Date of Deposit Stamped on Patent Applications MPEP 505 Saturday Deposit Date Stamped MPEP 505 Date of Deposit Stamped on Patent Application MPEP 505 Other Related FAQs 5 FAQs Collapse What happens if the date of receipt stamp is illegible or missing? What determines the filing date of a patent application? How are Priority Mail Express® submissions dated by the USPTO? How does the USPTO handle correspondence received on weekends or holidays? What happens if there&#8217;s a discrepancy between the USPTO&#8217;s date stamp and the date on the correspondence?