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| Patents for Robert J. Lewis | |||||
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| Number | Date | Patentee | Title | Type | |
| 488,906 | Dec. 27, 1892 | W.A. Dromgold, S.N. Hench, J.N. Richey | Sawmill-dog | sawmill dogs | |
| 491,447 | Feb. 07, 1893 | W.A. Dromgold, S.N. Hench, E.A. Reese | Mechanism for operating sawmill-carriages | sawmill carriages | |
| 491,494 | Feb. 07, 1893 | W.A. Dromgold, S.N. Hench, J.N. Richey | Mechanism for operating sawmill-carriages | sawmill carriages | |
| 540,618 | Jun. 04, 1895 | W.A. Dromgold, S.N. Hench | Harrow | harrows | |