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| All Patents in class 418/225 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,669 | Jun. 11, 1842 | B. Beale, J.T. Beale | Rotary Steam Engine | rotary steam engines | |
| 134,294 | Dec. 24, 1872 | J.C. Lamb, E. Lavens | Improvement in rotary pumps | rotary pumps | |
| 249,214 | Nov. 08, 1881 | W.H. Wigmore | Combined Gas, Air and Steam Rotary Engine | rotary steam engines | |
| 260,513 | Jul. 04, 1882 | W.H. Wigmore | Gas Motor Engine | gas and gasoline engines | |
| 2,333,304 | Nov. 02, 1943 | C. Herfurth, A.H. Dall, H. Ernst | Surface Finishing Machinery | grinding machines | |