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| Patents for Robert Stewart | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,372 | Nov. 25, 1841 | R. Stewart | Machine for sawing bilged staves for barrels, casks, etc. | barrel making machines | |
| 53,896 | Apr. 10, 1866 | R. Stewart | Annular Auger | auger bits | |
| 221,470 | Nov. 11, 1879 | S. Petty | Improvement in saw clamp | saw sets | |