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| Patents for O. E. Duffy | |||||
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| Number | Date | Patentee | Title | Type | |
| 305,206 | Sep. 16, 1884 | C.J. Lowe | Saw | crosscut saws | |
| 334,670 | Jan. 19, 1886 | W. Kratzer | Anti-friction journal-bearing | industrial machine bearings | |
| 335,527 | Feb. 02, 1886 | W. Kratzer | Anti-friction journal-bearing | industrial machine bearings | |
| 336,908 | Mar. 02, 1886 | A.J. Forbes | Railroad Nut Wrench | ratchet wrenches | |
| 371,476 | Oct. 11, 1887 | G.A. Reese | Lever-Wrench | pliers type wrenches | |