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| All Patents in class 123/90.25 | |||||
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| Number | Date | Patentee | Title | Type | |
| 230,470 | Jul. 27, 1880 | D. Clerk | Gas Motor Engine | gas and gasoline engines | |
| 460,070 | Sep. 22, 1891 | J.T. Hobbs, D.D. Hobbs | Rotary Gas Engine | rotary engines | |
| 535,815 | Mar. 19, 1895 | E.E. Pierce, W.L. Crouch | Gas Engine | gas and gasoline engines | |
| 816,062 | Mar. 27, 1906 | I.S. Barnett | Gas Engine | gas and gasoline engines | |