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| Patents for Charles H. Irwin | |||||
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| Number | Date | Patentee | Title | Type | |
| 306,907 | Oct. 21, 1884 | W.M. Dimitt | Auger Bit | drill bits | |
| 361,522 | Apr. 19, 1887 | C.H. Irwin | Auger Bit | drill bits | |
| 378,251 | Feb. 21, 1888 | C.H. Irwin | Die for Making Auger-Bits | making drills and augers | |
| 404,197 | May 28, 1889 | C.H. Irwin | Auger-Bit | auger bits | |
| 427,325 | May 06, 1890 | J.E. Hitch, F. Mill, C.H. Irwin | Boring-machine | portable timber mortisers | |
| 430,344 | Jun. 17, 1890 | F.I. Hoefle | Single Twist Auger Bit | auger bits | |
| 1,128,986 | Feb. 16, 1915 | C.H. Irwin | Angle Plate | track angle plates | |