| Patents for Donn Twitchell |
Patents 1 -
15
of 25
      |
| Number | Date | Patentee | Title | Type |
| 251,635 | Dec. 27, 1881 | H.W. Reed | Improved Monkey Wrench | quick adjust wrenches |
| 278,600 | May 29, 1883 | J. Robson | Gas Engine | gas and gasoline engines |
| 287,193 | Oct. 23, 1883 | J.L. Taylor | Pipe Wrench | pipe wrenches |
| 304,520 | Sep. 02, 1884 | G.B. Gable | Combination Tool | combination tools |
| 308,969 | Dec. 09, 1884 | J. Lussier | Wrench | angle adjustable wrenches |
| 336,815 | Feb. 23, 1886 | E.B. Barker, W.H. Lewis | Stand for Photographic Cameras | camera tripods |
| 339,813 | Apr. 13, 1886 | P. Ryan, J. Ryan | Wrench | wrench handle components |
| 342,119 | May 18, 1886 | J.W. Miller | Ratchet Wrench and Drill | ratchet wrenches |
| 347,580 | Aug. 17, 1886 | J.B. Dean | Wrench | quick adjust wrenches |
| 350,935 | Oct. 19, 1886 | J.G. Leslie | Wrench | quick adjust wrenches |
| 363,998 | May 31, 1887 | G.P. Evelyn | Spirit-Level | inclinometers |
| 409,921 | Aug. 27, 1889 | T.E. Cassidy | Combined Surface, Scratch, and Depth-Gage | surface gauges |
| 415,923 | Nov. 26, 1889 | J.L. Painter | Tool | combination tools |
| 419,254 | Jan. 14, 1890 | W.S. Hoskins | Improvements in Monkey Wrenches | quick adjust wrenches |
| 450,892 | Apr. 21, 1891 | W.H. Potter | Scriber | scribes |
