UNITED STATES PATENT OFFICE THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY ELECTRIC LAMP
Publication
United States Patent Office document, likely related to Edison's electric lamp patent.
The document forms part of Edison’s Patent No. 223,898, dated January 27, 1880
The application was filed on November 4, 1879
The patent describes an improvement in electric lamps, specifically focusing on the use of a carbon filament in a vacuum bulb to generate incandescent light.
The text outlines the technical details of the light-emitting carbonized filament, the method of vacuum sealing, and the materials used to maintain resistance and efficiency.
Edison’s innovation aimed to improve durability and reduce resistance loss, making incandescent lighting more practical.
Lewis Howard Latimer (1848–1928) was instrumental in Edison’s lightbulb development, particularly in refining the carbon filament process to make it more durable and commercially viable. Latimer’s own patent (U.S. Patent No. 252,386, issued in 1882) for the process of manufacturing carbon filaments significantly improved Edison’s design.
Latimer Family Papers (1870-1996 ) [QPL Full Collection]