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| All Patents in class 251/286 | |||||
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| Number | Date | Patentee | Title | Type | |
| 533,388 | Jan. 29, 1895 | H. Bolthoff | Register-valve | steam valves | |
| 1,174,211 | Mar. 07, 1916 | N.W. Whitbeck | Valve | valves | |
| 1,719,801 | Jul. 02, 1929 | G.B. Duffield | Valve | valves | |
| 2,167,433 | Jul. 25, 1939 | G.B. Duffield | Air Vent Valve | valves | |