| All Patents in class 251/282 |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 5,540 | Apr. 25, 1848 | W.B. Hill | Balance Valve for Steam Engines | traction engine governors |
| 16,351 | Jan. 06, 1857 | C. Bradley | Steam Balanced Valve | steam engine valve gear |
| 23,714 | Apr. 19, 1859 | C.A. Schultz | Steam Balanced Valve | steam engine valves |
| 27,381 | Mar. 06, 1860 | J.T. Plass | Slide-valve for steam-engines | steam engine valves |
| 59,848 | Nov. 20, 1866 | J. Lochhead | Improvement in balance slide valves | steam engine valves |
| 69,527 | Oct. 01, 1867 | G. Smith, J.N. Wrigley | Improvement in steam safety-valves | steam engine valves |
| 86,346 | Feb. 02, 1869 | J. Ashcroft | Safety Valve | steam safety valves |
| 172,603 | Jan. 25, 1876 | B. Brazelle | Improvement in balanced slide-valves | steam engine valves |
| 181,334 | Aug. 22, 1876 | L.H. Hall | Improvement in balanced valves | steam engine valves |
| 313,496 | Mar. 10, 1885 | D.C. Harlow | Valve for Steam Engines | steam engine valves |
| 314,258 | Mar. 24, 1885 | J.G. Miner | Balanced Slide Valve | steam engine valves |
| 439,349 | Oct. 28, 1890 | N.T. Greene | Slide-valve for steam-engines | steam engine valves |
| 1,112,233 | Sep. 29, 1914 | R.C. Stevens | Poppet Valve | steam engine valves |
| 1,772,406 | Aug. 05, 1930 | L.E. Whiton | Valve | steam valves |
| 2,020,773 | Nov. 12, 1935 | H. Ernst | Deflection Variator | metalworking machine mechanisms |
