How are application numbers assigned to patent applications?

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.