According to http://www.todayinsci.com/12/12_13.htm]Today in Science[/URL] <br /><br />"In 1816, the first U.S. patent for a dry dock was issued to John Adamson of Boston, Mass. A floating dry dock was built a few years later in Weehawhen Cave, Hoboken, N.J. for the dry docking and repair of canal boats. The patent was extended 14 years by act of Congress, 2 Mar 1831 (6 Stat. L. 458)."