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| Patents for Oscar Willis | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,871X | Dec. 21, 1831 | O. Willis | Gold, washing machine, called the railway car gold riddle | ore processing apparatus | |
| 7,222X | Sep. 05, 1832 | O. Willis | Gold, swinging, riddle, being an improvement on the railway car, for gold riddle, previously patented by him | ore processing apparatus | |
| 10,042 | Sep. 20, 1853 | O. Willis | Saw for water-wheels | water wheels | |