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| Patents for William Willis | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,517X | May 07, 1822 | W. Willis | Drill, cotton thinner and plough | plows | |
| 3,575X | Aug. 24, 1822 | W. Willis | Cutting box | ||
| 4,575X | Nov. 14, 1826 | W. Willis | Two cylinder atmospheric steam engine | steam engines | |
| 4,980X | Feb. 01, 1828 | W. Willis | Spring teeth rack frame for the steam engine | steam engines | |
| 5,098X | May 02, 1828 | W. Willis | Spring and valve marine propeller | ||