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| Patents for Joseph W. Dennis | |||||
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| Number | Date | Patentee | Title | Type | |
| 409,457 | Aug. 20, 1889 | F.A. Shoemaker, J.W. Dennis | Steam-engine | steam engines | |
| 424,183 | Mar. 25, 1890 | F.A. Shoemaker, J.W. Dennis | Reversing-valve for steam-engines | steam engine valves | |
| 437,941 | Oct. 07, 1890 | F.A. Shoemaker | Steam-engine | steam engines | |