| All Patents in class 251 |
Patents 16 -
30
of 438
      |
| Number | Date | Patentee | Title | Type |
| 17,604 | Jun. 16, 1857 | D.N. Coffin, Jr. | Faucet | faucets |
| 20,919 | Jul. 13, 1858 | B. Holly | Damper | stove pipes |
| 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 |
| 28,192 | May 08, 1860 | R. Nickerson, A.B. Colton | Valve-cock | |
| 33,095 | Aug. 20, 1861 | B.B. Moore | Hydrant | |
| 39,259 | Jul. 14, 1863 | B. Holly | Pump | pumps |
| 39,852 | Sep. 08, 1863 | W. Watts | Steam Pump | steam pumps |
| 54,153 | Apr. 24, 1866 | J.L. Hewes | Improvement in cut-off valves | |
| 54,701 | May 15, 1866 | E. Doty | Improved plug for washing-machines | washing machines |
| 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 |
| 70,784 | Nov. 12, 1867 | E.H. Bellows | Improvement in Slide Valves | steam engine valves |
| 77,387 | Apr. 28, 1868 | W.H. Laubach | Valve for Gas Engine | internal combustion engine valves |
| 79,679 | Jul. 07, 1868 | R.G. Packard | Globe Valve | valves |
