| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for Charles H. Irwin | |||||
      | |||||
| Picture | Number | Date | Patentee | Title | |
 | 306,907 | Oct. 21, 1884 | W.M. Dimitt | Auger Bit | |
 | 361,522 | Apr. 19, 1887 | C.H. Irwin | Auger Bit | |
 | 378,251 | Feb. 21, 1888 | C.H. Irwin | Die for Making Auger-Bits | |
 | 404,197 | May 28, 1889 | C.H. Irwin | Auger-Bit | |
 | 427,325 | May 06, 1890 | J.E. Hitch, F. Mill, C.H. Irwin | Boring-machine | |
 | 430,344 | Jun. 17, 1890 | F.I. Hoefle | Single Twist Auger Bit | |
| 1,128,986 | Feb. 16, 1915 | C.H. Irwin | Angle Plate | ||