Current U.S. classification information for all patent grants issued by the U.S. Patent and Trademark Office from 1790 to May 2018. Approximately 450 main divisions of technology, called classifications/classes, broken into approximately 150,000 subdivisions, called subclassifications/subclasses.

Current U.S. classification information for all patent applications (non-provisional utility and plant) published by the USPTO from 2001 to present. Approx. 450 main divisions of technology, called classifications/classes, broken into approx. 150,000 subdivisions, called subclassifications/subclasses.

Current U.S. classification information for all patent grants issued by the U.S. Patent and Trademark Office from 1790 to May 2018. Approximately 450 main divisions of technology, called classifications/classes, broken into approximately 150,000 subdivisions, called subclassifications/subclasses.