Source: U.S. Patent and Trademark Office
Utility patents are patents for invention. Patent origin is determined by the residence of the first-named inventor.
See Explanation of Data and Types of Patent Applications and Proceedings for more information.
U.S. Patent and Trademark Office, U.S. Granted Utility Patents Originating in an Undetermined County in California [PATENTCOUNTY06000], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/PATENTCOUNTY06000, June 13, 2021.