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| All Patents in class 123/90.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 430,312 | Jun. 17, 1890 | J.W. Eisenhuth | Single Acting Explosive Engine | ||
| 430,505 | Jun. 17, 1890 | J.F. Daly, M.M. Barrett | Gas Engine | gas and gasoline engines | |
| 449,507 | Mar. 31, 1891 | G.J. Weber | Gas Engine | gas and gasoline engines | |
| 532,555 | Jan. 15, 1895 | F. Hirsch | Gas Engine | gas and gasoline engines | |
| 577,898 | Mar. 02, 1897 | J. Walrath | Explosive Engine | internal combustion engine valves | |
| 586,826 | Jul. 20, 1897 | F.A. Redmon | Explosive Engine | internal combustion engines | |