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| All Patents in class 181/237 | |||||
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| Number | Date | Patentee | Title | Type | |
| 299,503 | Jun. 03, 1884 | H.G. Ashton | Safety Valves | steam safety valves | |
| 536,693 | Apr. 02, 1895 | R. Gould | Safety-valve | steam safety valves | |
| 631,370 | Aug. 22, 1899 | J. Hughes | Safety Valve and Muffler | steam safety valves | |
| 917,077 | Apr. 06, 1909 | C.H. Kaplinger | Safety Valve | steam safety valves | |