All Patents of Type: adjustable drill bits |
Patents 1 -
15
of 78
|
Number | Date | Patentee | Title | Type |
7,589 | Aug. 27, 1850 | C.L. Adamcourt | Expansible bit | adjustable drill bits |
9,398 | Nov. 16, 1852 | C.L. Barnes | Expanding bit | adjustable drill bits |
10,872 | May 02, 1854 | A. Weeks | Expansion-bit | adjustable drill bits |
13,261 | Jul. 17, 1855 | L.H. Gibbs | Expanding auger or bit | adjustable drill bits |
13,998 | Dec. 25, 1855 | J.P. Rollins | Extension-Bit | adjustable drill bits |
17,038 | Apr. 14, 1857 | A. Hall | Expansive bit | adjustable drill bits |
18,003 | Aug. 11, 1857 | A. Weeks | Expanding auger-bit | adjustable drill bits |
20,192 | May 11, 1858 | W.A. Clark | Method of seating the movable cutter in expansive bits | adjustable drill bits |
21,160 | Aug. 10, 1858 | W. Tucker | Variable-Boring Bit | adjustable drill bits |
21,597 | Sep. 28, 1858 | W.A. Clark | Expansive bit | adjustable drill bits |
22,195 | Nov. 30, 1858 | M. Norris | Auger for wood | adjustable drill bits |
27,946 | Apr. 17, 1860 | J. Blake | Auger | adjustable drill bits |
29,883 | Sep. 04, 1860 | J.M. Hathaway | Adjustable Auger | adjustable drill bits |
48,548 | Jul. 04, 1865 | F. Gleason | Improved Expanding Drill | adjustable drill bits |
49,336 | Aug. 08, 1865 | W. Brodhead | Improvement in boring-tool | adjustable drill bits |