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| Patents for John Duffus | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,395 | May 05, 1874 | J.C. Chapman | Slotting and Planing Tools | metal planers | |
| 154,455 | Aug. 25, 1874 | W.H. Hoffman, J.C. Chapman | Improvement in self-oiling journal-boxes and hangers | industrial machine bearings | |
| 164,560 | Jun. 15, 1875 | W.H. Hoffman | Improvement in mechanisms for adjusting lathe-beds to different heights | metal lathes | |