Portal:U. S. patents




 * X1 - "the making of Pot ash and Pearl ash by a new Apparatus and Process", Samuel Hopkins, issued July 31, 1790.
 * 1 - "Locomotive steam-engine for rail and other roads", John Ruggles, issued July 13, 1836.
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 * 1,004,581
 * 1,117,746
 * 1,232,282
 * 1682572
 * 1,549,622
 * 1,587,716
 * 1,600,494
 * 6,368,227