How are application numbers assigned to patent applications?

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.

Application numbers for patent applications are assigned by the Office of Patent Application Processing (OPAP) as follows:

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• Nonprovisional applications are assigned numbers beginning with the series code ’15’ or ’16’.

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• Design applications are assigned numbers beginning with the series code ’29’.

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• Plant applications are assigned numbers beginning with the series code ’16’.

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• Provisional applications are assigned numbers beginning with the series code ’62’.

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• Reexamination proceedings are assigned numbers beginning with the series code ’90’.

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As stated in the MPEP 503, “The application number includes a two-digit series code and a six-digit serial number.” This system allows for efficient categorization and tracking of different types of patent applications.

For more information on application number, visit: application number.

For more information on patent application types, visit: patent application types.

For more information on series code, visit: series code.