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| Patents for Charles Richards | |||||
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| Number | Date | Patentee | Title | Type | |
| 91,269 | Jun. 15, 1869 | W. Curtiss, C. Richards | Improvement in cutter-head | cutterheads | |
| 260,609 | Jul. 04, 1882 | C. Richards | Monkey-Wrench | nut wrenches | |
| 263,402 | Aug. 29, 1882 | C. Hart | Die Stock for Cutting Threads | tap wrenches and die stocks | |