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| Patents for J. M. Hartnett | |||||
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| Number | Date | Patentee | Title | Type | |
| 370,048 | Sep. 20, 1887 | H.W. De Courtenay | Combination Wrench | bicycle or pocket wrenches | |
| 447,377 | Mar. 03, 1891 | D.P. Stanton | Pipe Wrench | pipe wrenches | |
| 458,359 | Aug. 25, 1891 | J.A. Lonie, W.A. Cropper | Drill Gage | drill accessories | |
| 504,000 | Aug. 29, 1893 | M.M. Aust, C.P. Thiel | Machine for Grinding Thread Cutting Tools | tool grinders | |
| 508,732 | Nov. 14, 1893 | V.W. Mason, Jr. | Vise for Milling Machines or Planers | metalworking machine vises | |