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| All Patents in class 251/333 | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,873 | May 15, 1855 | J.A. Reed | Steam-Engine Valve | steam pumps | |
| 860,141 | Jul. 16, 1907 | J.P. Lavigne | Quick Opening Valve | industrial valves | |
| 881,060 | Mar. 03, 1908 | J.J. Cook | Valve | valves | |
| 1,555,025 | Sep. 29, 1925 | F.E. Raymond | Valve | industrial valves | |
| 2,021,773 | Nov. 19, 1935 | P.H. Gentzel | Relief Valve | steam safety valves | |
| 2,051,509 | Aug. 18, 1936 | D.D. Wile | Valve | valves | |
| 2,446,274 | Aug. 03, 1948 | J.N. Gladden | Valve | internal combustion engine valves | |