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| Patents for Mackintosh-Hemphill Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,439,341 | Dec. 19, 1922 | H.H. Talbot | Rolling-mill drive | steel maker | |
| 1,514,405 | Nov. 04, 1924 | H.H. Talbot | Variable-speed rolling-mill drive | steel maker | |
| 2,368,151 | Jan. 30, 1945 | W.M. McConnell | Lathe carriage drive | metal lathes | |