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| All Patents in class 418/173 | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,542 | May 19, 1863 | W.B. Allyn | Rotary Steam Engine | rotary steam engines | |
| 449,325 | Mar. 31, 1891 | W.J. Kendig | Rotary Engine | rotary steam engines | |
| 455,028 | Jun. 30, 1891 | G. Westinghouse, Jr. | Rotary Engine | rotary steam engines | |
| 917,944 | Apr. 13, 1909 | B.F. Hoffman | Rotary Engine | rotary steam engines | |
| 990,163 | Apr. 18, 1911 | J.W. von Pittler | Rotary engine | rotary engines | |
| 3,011,449 | Dec. 05, 1961 | W. Ernst | Vaned Hydraulic Unit | hydraulic apparatus | |