Patent and patent application classification information (current) available bimonthly (odd months) (patent classification products)Back to Results
Classification Standards and Development (CSD) maintains the patent classification systems.
Current U.S. classification information for all patent grants issued by the USPTO from 1790 to present. Approx. 450 main divisions of technology, called classifications/classes, broken into approx. 150,000 subdivisions, called subclassifications/subclasses. Provided in patent grant sequence, by patent grant number with the current U.S. original classification/subclassification and any cross-reference classification/subclassifications with the format of ASCII text.
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