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| Patents for William Harper | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,593X | Oct. 15, 1811 | W. Harper | Breaking flax and hemp | ||
| 3,090X | Apr. 02, 1819 | W. Harper | Elastic seat saddles | ||
 | 993,366 | May 30, 1911 | W. Harper, F.W. Converse | Planer-knife sharpener | |
 | 993,367 | May 30, 1911 | W. Harper | Planer-knife jointer | |
 | 1,020,416 | Mar. 19, 1912 | W. Harper | Planer-knife-adjusting mechanism | |