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| Patents for James Leffel | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,056 | May 21, 1845 | J. Leffel | Improvement in water-wheels | water wheels | |
| 34,150 | Jan. 14, 1862 | J. Leffel | Improved water-wheel | turbine water wheels | |
| RE1,791 | Oct. 11, 1864 | J. Leffel | Improvement in water-wheels | turbine water wheels | |
| RE1,792 | Oct. 11, 1864 | J. Leffel | Improvement in cases for water-wheels | turbine water wheels | |