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| All Patents in class 418/122 | |||||
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| Number | Date | Patentee | Title | Type | |
| 69,383 | Oct. 01, 1867 | M.L. Andrew | Improvement in rotary engines | rotary steam engines | |
| 89,269 | Apr. 27, 1869 | M.L. Andrew | Improvement in rotary pumps | rotary pumps | |
| 420,331 | Jan. 28, 1890 | A.F. Brown | Rotary Engine | rotary steam engines | |
| 630,426 | Aug. 08, 1899 | C.F. Thurber | Rotary pump | ||
| 914,627 | Mar. 09, 1909 | J.S. Alcorn | Rotary engine | rotary steam engines | |