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| All Patents in class 91/281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 22,641 | Jan. 18, 1859 | H. Goulding | Steam-valve | steam engine valves | |
| 1,260,184 | Mar. 19, 1918 | J.C. Glenn | Fluid-Operated Valve Mechanism | steam engine valves | |
| 2,851,996 | Sep. 16, 1958 | W.S. Bunnell | Hydraulic Control Valve for Machine Tools | hydraulic apparatus | |