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| Patents for Charles G. C. Simpson | |||||
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| Number | Date | Patentee | Title | Type | |
| 84,365 | Nov. 24, 1868 | J. Lough | Improvement in dressing saw-teeth | saw sharpening machines | |
| CA-909 | Apr. 04, 1871 | W.H. Barwick | Barwick Improved Wrench | pliers type wrenches | |
| 115,678 | Jun. 06, 1871 | W.H. Barwick | Improvement in Pipe-Wrenches | pipe tongs | |
| 134,064 | Dec. 17, 1872 | H.R. Ives | Combination Household Tool | combination tools | |
| 345,228 | Jul. 06, 1886 | I. Fréchette | Car-axle lubricator | railroad cars and carriages | |