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| All Patents in class 60/39.23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,866 | Jun. 09, 1863 | S.H. Roper | Hot Air Engine | hot air engines | |
| 190,490 | May 08, 1877 | L.P. Martin, J. Hock | Hot Air Engine | hot air engines | |
| 293,185 | Feb. 05, 1884 | H.S. Maxim | Hot Air or Gas Engine | gas and gasoline engines | |
| 403,294 | May 14, 1889 | J.C. Beckfeld, A. Schmid | Air and Gas Engine | gas and gasoline engines | |