What is an application number and how is it assigned?

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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. An application number consists of a series code and a serial number. It is assigned by the Office of Patent Application Processing (OPAP) immediately after mail has been opened. For applications filed using the USPTO patent electronic filing system, EFS-Web provides an Acknowledgement Receipt containing a time and date stamp, application number, and confirmation number. The MPEP states: ‘Application numbers consisting of a series code and a serial number are assigned by the Office of Patent Application Processing (OPAP) immediately after mail has been opened.’ (MPEP 503) Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Filing Receipt Assigns Application Number and Confirmation MPEP 503 Notification of Application Number and Filing Date MPEP 503 Confirmation Number Required for Filing Receipt and Office Actions MPEP 503 Self-Addressed Postcard With Application Number and Date MPEP 503 Filing Receipt Controls Application Number MPEP 503 Permitted Confirmation Number Required for Application Identification MPEP 503 Confirmation Number Required for Application Verification MPEP 503 Electronic Acknowledgement Receipt for Successful Submission MPEP 503 Confirmation Number Available Through USPTO Filing System MPEP 503 Filing Receipt Includes Application Details MPEP 503 Other Related FAQs 5 FAQs Collapse How does the USPTO handle applications filed with missing parts? What are the series codes for different types of patent applications? What information is included in a patent filing receipt? How can I get a receipt for items filed with the USPTO? Can a patent application be returned to the applicant after filing?