| All Patents in class 137 |
Patents 16 -
30
of 742
      |
| Number | Date | Patentee | Title | Type |
| 909 | Sep. 08, 1838 | J.M. Jorden | Improvement in Fire-Plugs and Hydrants to Prevent the Water From Freezing in Them | auxiliary wrenches |
| 3,931 | Feb. 28, 1845 | S. Talbott | Steam-valve | steam engine valves |
| 4,542 | May 28, 1846 | W.H. Baker, H.R. Worthington | Balancing valves of steam-engines | steam engine valves |
| 5,540 | Apr. 25, 1848 | W.B. Hill | Balance Valve for Steam Engines | traction engine governors |
| 6,128 | Feb. 20, 1849 | J. Mulbery | Short Slide-Valve by Chamfering Corners | |
| 7,023 | Jan. 15, 1850 | W. Kennish | Hydraulic Engine | turbine water wheels |
| 7,353 | May 07, 1850 | T.C. Theaker | Improvement in Oscillating Valves of Steam Engines | steam engine valves |
| 7,755 | Nov. 05, 1850 | J. Judson, A. Judson | Valve for governors | steam engine governors |
| 7,886 | Jan. 07, 1851 | W. Maguire | Machine for jointing staves | barrel making machines |
| 7,964 | Mar. 04, 1851 | H. Waterman | Variable Cut-Off Regulated by the Governor | steam engine governors |
| 8,376 | Sep. 23, 1851 | W. Merrell | Lath-machine | lath making machines |
| 8,923 | May 04, 1852 | J. McClintic | Differential safety-valve | steam safety valves |
| 9,103 | Jul. 06, 1852 | E. Rogers | Mode of Grinding Puppet-Valves While the Engine is in Motion | steam engine valves |
| 9,336 | Oct. 12, 1852 | J. Tremper | Governor | steam engine governors |
| 12,122 | Jan. 02, 1855 | T.H. Burley | Dovetailing machine | dovetailing machines |
