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All Patents in class 408/212
Patents 1 - 15 of 55
First set of recordsNext set of recordsLast set of records
13,261Jul. 17, 1855L.H. GibbsExpanding auger or bitadjustable drill bits
20,192May 11, 1858W.A. ClarkMethod of seating the movable cutter in expansive bitsadjustable drill bits
22,474Dec. 28, 1858H. StoneExpanding bitdrill bits
27,946Apr. 17, 1860J. BlakeAugeradjustable drill bits
29,793Aug. 28, 1860W.A. IvesSingle-Spur Double-Twist Auger Bitauger bits
29,883Sep. 04, 1860J.M. HathawayAdjustable Augeradjustable drill bits
47,946May 30, 1865C.L. GriswoldImprovement in Augersauger bits
52,056Jan. 16, 1866E.G. LamsonImprovement in Augersauger bits
55,132May 29, 1866S.L. LyfordImprovement in Gages for Augersdrill depth stops
RE3,879Mar. 15, 1870I.T. PayneImprovement in Augersauger bits
111,099Jan. 17, 1871B. WalchAdjustable Spur Augeradjustable drill bits
124,089Feb. 27, 1872H.S. ShepardsonImprovement in bitsdrill bits
131,946Oct. 08, 1872E. FordImprovement in expansive bitsadjustable drill bits
141,324Jul. 29, 1873W.A. ClarkImprovement in Expansive Bitsadjustable drill bits
155,333Sep. 22, 1874W.L. ParmeleeImprovement in expansion-bitsadjustable drill bits
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