Patent and patent application classification information (current) available bimonthly (odd months) (patent classification products)
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Classification Standards and Development (CSD) maintains the patent classification systems.
Contains Cooperative Patent Classification (CPC) classification information for all Utility patent grants issued by the U.S. Patent and Trademark Office (USPTO) from 1790 to present. It is available as XML with schemas or text monthly (usually by the 15th of the month).
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