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