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| Patents for Hiram A. Gray | |||||
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| Number | Date | Patentee | Title | Type | |
| 255,208 | Mar. 21, 1882 | J.H. Taylor | Grinding Machine | grinding machines | |
| 275,029 | Apr. 03, 1883 | J.M. Evarts | Machine for Bending Pipe | pipe bending machines | |
| 289,056 | Nov. 27, 1883 | R.C. Ellrich, G.S. Allen | Screwdriver | screwdriver handles | |