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| Patents for Charles N. Leonard | |||||
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| Number | Date | Patentee | Title | Type | |
| 342,172 | May 18, 1886 | G.S. Black | Saw Swaging Machine | metal swaging machines | |
| 1,127,457 | Feb. 09, 1915 | A.B. Landis | Cutter-head | metal threading machines | |
| 1,221,193 | Apr. 03, 1917 | A.B. Landis | Cutter-head | metal threading machines | |