US Patent 1,647, Improvement in the mode of communicating information by signals by the application of electro-magnetism, June 20, 1840 - US Patent 1,647 (Reissue #79), January 15, 1846 - US Patent 1,647 (Reissue #117), June 13, 1848 -
(Reissue #118), June 13, 1848 - US Patent 4,453, April 11, 1846 - US Patent 6,420, May 1, 1849