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All Patents of Type: adjustable drill bits
Patents 1 - 15 of 74
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NumberDatePatenteeTitleType
7,589Aug. 27, 1850C.L. AdamcourtExpansible bitadjustable drill bits
9,398Nov. 16, 1852C.L. BarnesExpanding bitadjustable drill bits
10,872May 02, 1854A. WeeksExpansion-bitadjustable drill bits
13,261Jul. 17, 1855L.H. GibbsExpanding auger or bitadjustable drill bits
13,998Dec. 25, 1855J.P. RollinsExtension-Bitadjustable drill bits
17,038Apr. 14, 1857A. HallExpansive bitadjustable drill bits
18,003Aug. 11, 1857A. WeeksExpanding auger-bitadjustable drill bits
20,192May 11, 1858W.A. ClarkMethod of seating the movable cutter in expansive bitsadjustable drill bits
21,160Aug. 10, 1858W. TuckerVariable-Boring Bitadjustable drill bits
21,597Sep. 28, 1858W.A. ClarkExpansive bitadjustable drill bits
22,195Nov. 30, 1858M. NorrisAuger for woodadjustable drill bits
27,946Apr. 17, 1860J. BlakeAugeradjustable drill bits
29,883Sep. 04, 1860J.M. HathawayAdjustable Augeradjustable drill bits
48,548Jul. 04, 1865F. GleasonImproved Expanding Drilladjustable drill bits
49,336Aug. 08, 1865W. BrodheadImprovement in boring-tooladjustable drill bits
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