U.S. Patents

• Patent 2,064 - Squire Whipple, "Iron-Truss Bridge" (1841)
• Patent 3,523 - Otis & Caleb Pratt, "Truss-Frame for Bridges" (1844)
• Patent 8,624 - Wendel Bollman, "Suspension Bridge" (1852)
• Patent 10,887 - Albert Fink, "Truss Bridge" (1854)
• Patent 100,185 - Charles Parker, "Truss Bridge" (1870)
• Patent 529,220 - J.A.L. Waddell, "Truss Bridge" (1894) (1)