First one
Lewis Howard Latimore
In 1874, he co-patented (with Charles W. Brown) an improved toilet system for railroad cars called the Water Closet for Railroad Cars (U.S. Patent 147,363)
Latimer received a patent in January 1881 for the "Process of Manufacturing Carbons", an improved method for the production of carbon filaments used in lightbulbs
Later he invented a locking rack for hats, coats, and umbrellas.