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| Patents for James Duncan | |||||
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| Number | Date | Patentee | Title | Type | |
| 141,264 | Jul. 29, 1873 | W.H. Arnold, J. Duncan | Improvement in hub-boring machines | wheelwright | |
| 157,162 | Nov. 24, 1874 | W.H. Talbot, J. Duncan | Improvement in Bench Planes | scraper planes | |
| 315,014 | Apr. 07, 1885 | J. Duncan | Bench plane | scraper planes | |