| All Patents in class 91/333 |
Patents 1 -
15
of 18
      |
| Number | Date | Patentee | Title | Type |
| 10,398 | Jan. 03, 1854 | W. Wright | Operating Cut-Off Valves of Steam Engines | steam engine valves |
| 21,907 | Oct. 26, 1858 | C.A. Schultz | Reciprocating Steam Engine | steam engines |
| 73,069 | Jan. 07, 1868 | J.F. Allen | Improvement in valve-gear | steam engine valve gear |
| 172,116 | Jan. 11, 1876 | A.O. Whittemore, G.W. Hall | Engine-Governor | steam engine governors |
| 176,141 | Apr. 18, 1876 | J. Knowlson | Cut-Offs and Gears | steam engine valve gear |
| 336,837 | Feb. 23, 1886 | N.F. Burnham | Steam Engine | steam engines |
| 359,926 | Mar. 22, 1887 | W.S. Halsey | Steam Engine | steam engines |
| 374,752 | Dec. 13, 1887 | G.M. Pelton | Valve-gear | steam engine valve gear |
| 381,747 | Apr. 24, 1888 | J. Young | Valve-gear | steam engine valve gear |
| 423,963 | Mar. 25, 1890 | J.B. Stanwood | Steam-engine | steam engine valves |
| 451,720 | May 05, 1891 | H. Bolthoff | Steam-engine | steam engine valves |
| 603,475 | May 03, 1898 | J. Stumpf | Cut-off mechanism for steam-engines | steam engine valves |
| 642,621 | Feb. 06, 1900 | M.R. Moore | Valve Gear for Engines | steam engine valve gear |
| 655,096 | Jul. 31, 1900 | F.A. Large | Governor Cut-Off Valve for Engines | steam engine governors |
| 893,188 | Jul. 14, 1908 | I.E. McElroy | Cut Off Valve for Engines | steam engine valves |
