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| Patents for Alfred J. O'Brien | |||||
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| Number | Date | Patentee | Title | Type | |
| 563,217 | Jun. 30, 1896 | H. Bolthoff | Ore-feeder for stamp-mills | ore processing apparatus | |
| 568,832 | Oct. 06, 1896 | H. Bolthoff | Hoisting-machine | industrial elevators and lifts | |
| 582,616 | May 18, 1897 | H. Bolthoff | Hoisting-machine | hoists, winches, come-alongs | |