Cooperative Patent Classification (CPC) Master Classification File (MCF) for U.S. Patent Applications (2001 - Present)
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Contains Cooperative Patent Classification (CPC) classification information for all Utility patent applications published by the U.S. Patent and Trademark Office (USPTO) from 2001 to present. It is available as XML with schemas or text monthly (usually by the 15th of the month).
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uspto.data.commerce.gov
