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| All Patents in class 418/205 | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,350 | Feb. 06, 1855 | B. Holly | Rotary Pump | rotary pumps | |
| 237,764 | Feb. 15, 1881 | E. Medden | Rotary pump | rotary pumps | |
| 728,263 | May 19, 1903 | W.H. Masterman, J.P. Magney | Rotary Engine | rotary steam engines | |