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| Patents for Charles E. Callahan | |||||
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| Number | Date | Patentee | Title | Type | |
| 89,268 | Apr. 27, 1869 | M.L. Andrew | Improvement in rotary pumps | rotary pumps | |
| 97,908 | Dec. 14, 1869 | G.A. Gray, Jr. | Improved radial drilling-machine | drilling and boring | |
| 1,111,671 | Sep. 22, 1914 | G. Peter | Jointer Guard | jointers | |