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| Patents for Henry C. Sergeant | |||||
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| Number | Date | Patentee | Title | Type | |
| 147,402 | Feb. 10, 1874 | S. Ingersoll | Improvement in rock-drills | mining apparatus | |
| 147,403 | Feb. 10, 1874 | G.R. Cullingworth, H.C. Sergeant, A.H. Elliott, S. Ingersoll | Improvement in steam-engines for rock-drills, &c. | mining apparatus | |
| RE6,292 | Feb. 16, 1875 | S. Ingersoll | Improvement in machines for drilling rock | mining apparatus | |