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| All Patents in class 418/140 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 208,298 | Sep. 24, 1878 | J. Darling | Rotary- Engines | ||
| 464,162 | Dec. 01, 1891 | M.J. Mapes | Rotary Steam Engine | ||
| 465,907 | Dec. 29, 1891 | W.N. Whipple | Rotary Steam Engine | ||
 | 711,239 | Oct. 14, 1902 | E.B. Tree | Rotary Engine | |
| 924,899 | Jun. 15, 1909 | V.M. Fulcher | Rotary Engine | ||
| 4,898,524 | Feb. 06, 1990 | J.K. Butzen | Fluid Driven Rotary Motor | ||