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| All Patents in class 418/261 | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,721 | Jun. 02, 1863 | C. Avery | Rotary Steam Engine | rotary steam engines | |
| 453,612 | Jun. 09, 1891 | S.G. Brosius | Rotary Engine | rotary engines | |
| 894,391 | Jul. 28, 1908 | J.W. von Pittler | Rotary engine | rotary engines | |