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| All Patents in class 91/21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 810,601 | Jan. 23, 1906 | B.F. Augustine | Rotary Engine | rotary steam engines | |
| 914,627 | Mar. 09, 1909 | J.S. Alcorn | Rotary engine | rotary steam engines | |
| 1,070,086 | Aug. 12, 1913 | J.H. Van Deventer | Rotary Engine | rotary steam engines | |
| 1,174,431 | Mar. 07, 1916 | C. Miller | Rotary Engine | rotary steam engines | |