| All Patents in class 91/331 |
Patents 1 -
15
of 27
      |
| Number | Date | Patentee | Title | Type |
| 10,276 | Nov. 29, 1853 | R.R. Taylor | Arrangement of valves, ports, and passages for operating steam-hammers | steam hammers |
| 10,486 | Jan. 31, 1854 | P.L. Weimer | Steam Hammer | steam hammers |
| 125,838 | Apr. 16, 1872 | A.T. Nichols | Improvement in steam-engines | steam engines |
| 172,116 | Jan. 11, 1876 | A.O. Whittemore, G.W. Hall | Engine-Governor | steam engine governors |
| 183,446 | Oct. 17, 1876 | B. Brazelle | Improvement in variable cut-offs for direct-acting engines | steam engine valves |
| 278,841 | Jun. 05, 1883 | J.R. Wells | Compound Balanced Steam Engine | compound steam engines |
| 302,835 | Jul. 29, 1884 | H.F. Frisbie | Valve Gear for Puppet Valve Engines | steam engine valve gear |
| 314,381 | Mar. 24, 1885 | A.L. Ide | Steam Engine Frame | steam engine beds |
| 364,225 | Jun. 07, 1887 | H.E. Doggett | Steam Motor | steam engines |
| 374,752 | Dec. 13, 1887 | G.M. Pelton | Valve-gear | steam engine valve gear |
| 389,382 | Sep. 11, 1888 | J. Grime | Valve Gear for Engines | steam engine valve gear |
| 422,769 | Mar. 04, 1890 | N.T. Greene | Liberating valve-gear for engines | steam engine valve gear |
| 444,563 | Jan. 13, 1891 | E.J. Woolf | Valve-Gear for Engines | steam engine valve gear |
| 471,253 | Mar. 22, 1892 | C.T. Noyes, T.W. Heintzelman | Valve Gear for Compound Engines | steam engine valve gear |
| 475,427 | May 24, 1892 | E.J. Woolf | Single Cylinder Compound Engine | compound steam engines |
