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| All Patents in class 91/481 | |||||
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| Number | Date | Patentee | Title | Type | |
| 364,225 | Jun. 07, 1887 | H.E. Doggett | Steam Motor | steam engines | |
| 540,757 | Jun. 11, 1895 | F.W. Ofeldt | Vapor Engine | internal combustion engines | |
| 858,617 | Jul. 02, 1907 | A.L. Mowry | Rotary engine | rotary steam engines | |
| 1,964,245 | Jun. 26, 1934 | H.F. MacMillin, E.K. Benedek | Constant Delivery Radial Piston Pump | hydraulic pumps | |