| All Patents in class 251/187 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 8,303X | Jul. 10, 1834 | J. Kirkpatrick | Self-balance steam valves | |
| 15,400 | Jul. 22, 1856 | H.R. Worthington | Relieving steam slide-valves from pressure | steam engine valve gear |
| 27,381 | Mar. 06, 1860 | J.T. Plass | Slide-valve for steam-engines | steam engine valves |
| 181,334 | Aug. 22, 1876 | L.H. Hall | Improvement in balanced valves | steam engine valves |
| 382,674 | May 08, 1888 | D.A. Woodbury | Adjusting Relief-Plate Wedges of Slide Valves | steam engine valve gear |
| 396,737 | Jan. 29, 1889 | C.M. Farrar | Balanced Valve | |
