On May 20, 1873, an icon American fashion was born, or at least patented, when the United States Patent and Trademark Office issued U.S. Patent No. 139,121, titled Fastening Pocket-Openings. The ’121 patent, which was granted to Jacob W. Davis and jointly assigned to himself and to Levi Strauss & Company, ushered in the era of denim blue jeans. The ’121 patent specifically related to copper rivet fasteners for denim trousers, which proved to be extremely desirable and durable.