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| All Patents in class 418/199 | |||||
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| Number | Date | Patentee | Title | Type | |
| 761,799 | Jun. 07, 1904 | E.C. Warren | Rotary Engine | rotary steam engines | |
| 1,026,887 | May 21, 1912 | J.H. Van Deventer | Rotary Engine | rotary steam engines | |
| 2,185,338 | Jan. 02, 1940 | E.C. Hassler | Fluid handling apparatus | rotary pumps | |
| 3,578,890 | May 18, 1971 | O.F. Jensen | Rotary Steam Engine | rotary steam engines | |