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| Patents for Harding Allen | |||||
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| Number | Date | Patentee | Title | Type | |
| 583,443 | Jun. 01, 1897 | H. Allen | Mowing-machine sharpener | ||
| 648,648 | May 01, 1900 | H. Allen | Mower-knife grinder | ||
| 740,016 | Sep. 29, 1903 | L.A. Howe | Self-opening die | ||
| 901,515 | Oct. 20, 1908 | H. Allen | Driving mechanism for spindles | drill presses | |
| 962,690 | Jun. 28, 1910 | H. Allen | Driving mechanism for drill-spindles | drill presses | |
| 1,075,280 | Oct. 07, 1913 | H. Allen | Gearing | drill presses | |
| 1,121,599 | Dec. 22, 1914 | H. Allen | Belt driving mechanism | drill presses | |