Subject: Patent infringement

Billhead from A.B. Elfelt & Co., dated April 3, 1873, indicating a change of address from 111 Battery Street to 108 & 110 Sansome Street, San Francisco. The billhead notes that the company was the sole manufacturer of Patent Champion Overalls on the Pacific Coast and mentions a lawsuit with Levi Strauss. It also states that bills are payable in U.S. Gold Coin. The company, established in 1867, had a corresponding firm in New York City: Elfelt, Levi & Co., located at 132 Church Street. The description includes details about the company's history, its involvement in a patent infringement lawsuit with Levi Strauss, and its eventual decline. The billhead reflects the company's activities in the San Francisco business community and its place within the larger context of the development of the American workwear industry in the 19th century.

Billhead from A.B. Elfelt & Co., dated June 18, 1873. The company was located at 108 & 110 Sansome St., San Francisco, and operated as a clothing warehouse. This billhead predates the company's involvement in a lawsuit with Levi Strauss over the use of copper rivets on pockets. A.B. Elfelt & Co. had a corresponding firm in New York City: Elfelt, Levi & Co., located at 74 & 76 Thomas Street. Established in San Francisco in 1867, the company manufactured workwear at wholesale. Following Levi Strauss' success, Elfelt created their own riveted work pants, leading to a patent infringement lawsuit. Later, A.B. Elfelt patented their Champion Overalls. The billhead specifies that payments are to be made in U.S. Gold Coin. The company's advertising was scant, especially in regional newspapers.