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| Patents for John W. Ashman | |||||
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| Number | Date | Patentee | Title | Type | |
| 463,820 | Nov. 24, 1891 | T.H. Worrall, A. Lesperance | Clutch | metalworking power transmission | |
| 586,263 | Jul. 13, 1897 | T.H. Worrall, A. Lesperance | Power-shifting device for clutch mechanisms | metalworking power transmission | |
| 606,634 | Jun. 28, 1898 | T.H. Worrall, A. Lesperance | Friction-clutch | metalworking power transmission | |