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| Patents for A. J. O'Brien | |||||
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| Number | Date | Patentee | Title | Type | |
| 630,925 | Aug. 15, 1899 | P.H. Poppert | Pipe Wrench and Cutter | pipe wrenches | |
| 663,819 | Dec. 11, 1900 | E.B. Newnam | Foot Vise | ||
| 722,119 | Mar. 03, 1903 | G.M. Loftiss | Calf Weaner | animal weaners | |
| 785,847 | Mar. 28, 1905 | S.W. Akins | Butt-Hinge Gage | butt gauges | |
| 793,561 | Jun. 27, 1905 | H. Bolthoff | Engine | industrial elevators and lifts | |
| 900,044 | Sep. 29, 1908 | N.E. Swanson | Hollow Auger | hollow bits | |
| 965,716 | Jul. 26, 1910 | W.J. Kelly | Farrier's nail driving hammer | farrier | |