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| Patents for Charles H. Hill | |||||
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| Number | Date | Patentee | Title | Type | |
| 158,172 | Dec. 29, 1874 | C.H. Hill, A.W. Proctor | Improvement in machine for grinding knives | cutter grinding | |
| 158,173 | Dec. 29, 1874 | C.H. Hill, A.W. Proctor | Improvement in belt-shifters | cutter grinding | |
| 2,074,844 | Mar. 23, 1937 | C.H. Hill | Metalworking Machine | metal lathe accessories and attachments | |