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| All Patents in class 91/8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 309,278 | Dec. 16, 1884 | C.C. Worthington | Duplex compound engine | steam pumping engines | |
| 538,694 | May 07, 1895 | F.W. Ofeldt | Vapor Engine | internal combustion engines | |
| 654,759 | Jul. 31, 1900 | J.B. O'Donnell | Duplex Steam Engine | steam engines | |
| 680,510 | Aug. 13, 1901 | E.C. Warren | Rotary Engine | rotary steam engines | |