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| Patents for Primm R. Hawthorne | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,090,476 | Mar. 17, 1914 | P.R. Hawthorne | Radiator | cooling apparatus | |
| 1,101,542 | Jun. 30, 1914 | P.R. Hawthorne | Steering-Gear for Motor-Propelled Vehicles | steering apparatus | |
| 1,396,956 | Nov. 15, 1921 | P.R. Hawthorne | Tractor | tractors | |