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| Patents for James O'Brien | |||||
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| Number | Date | Patentee | Title | Type | |
| 200,219 | Feb. 12, 1878 | S.J. Randall, J. O'Brien | Improvement in insertable saw-teeth | insertable saw teeth | |
| 442,426 | Dec. 09, 1890 | J. Donnelly | Pliers | pliers | |
| 1,035,143 | Aug. 13, 1912 | W.J. Bayrer | Clamping device | drill presses | |
| 1,049,984 | Jan. 07, 1913 | C.L. Bowers | Wheel-locking device | metalworking power transmission | |
| 1,073,683 | Sep. 23, 1913 | W.J. Bayrer, R.G. Henry | Belt-shifter | metalworking power transmission | |