20 May 1873; What Happened?

20 May 1873 - Levi Strauss and Jacob Davis receive a U.S. patent for blue jeans.

Levi Strauss, as a young man in 1851, went from Germany to New York to join his older brothers who ran a goods store. In 1853, he moved to San Francisco to open his own dry goods business. Jacob Davis was a tailor who often bought bolts of cloth from the Levi Strauss & Co. wholesale house. In 1872, Davis wrote to Strauss asking to partner with him to patent and sell clothing reinforced with rivets. The copper rivets were to reinforce the points of stress, such as pocket corners and at the bottom of the button fly. Levi accepted Davis's offer, and the two men received US patent No. 139,121 for an "Improvement in Fastening Pocket-Openings" on May 20, 1873.

Davis and Strauss experimented with different fabrics. An early attempt was brown cotton duck, a bottom-weight fabric. Finding denim a more suitable material for work-pants, they began using it to manufacture their riveted pants. The denim used was produced by an American manufacturer, but popular legend states it was imported from Nimes, France. A popular myth is that Strauss initially sold brown canvas pants to miners, later dyed them blue, turned to using denim, and only after Davis wrote to him, added rivets.