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| All Patents in class 418/219 | |||||
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| Number | Date | Patentee | Title | Type | |
| 22,955 | Feb. 15, 1859 | S. Huse | Rotary Steam Engine | rotary steam engines | |
| 894,391 | Jul. 28, 1908 | J.W. von Pittler | Rotary engine | rotary engines | |
| 905,476 | Dec. 01, 1908 | E.W. Gragert, F. Stoehr | Rotary Engine | rotary steam engines | |
| 2,431,122 | Nov. 18, 1947 | H.S. Jakobsen | Variable Volume Hydraulic Pump of the Axially Oscillating Vane Type | hydraulic pumps | |