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| All Patents in class 29/888.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 306,314 | Oct. 07, 1884 | C.G. Beechey | Gas Regulating Valve for Gas Engines | internal combustion engine valves | |
| 933,698 | Sep. 07, 1909 | G.L. Crook | Valve | internal combustion engine valves | |
| 1,346,416 | Jul. 13, 1920 | C.H. Newton | Valve Spring Compressor | valve spring tools | |
| 2,056,160 | Oct. 06, 1936 | H.L. Allen | Valve Element and the Method of Forming the Same | internal combustion engine valves | |