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All Patents of Type: twist drill bits
Patents 1 - 15 of 20
First set of recordsNext set of recordsLast set of records
6,088Feb. 06, 1849H. PeelerImproved Method of Boring Gun-Barrelstwist drill bits
38,119Apr. 07, 1863S.A. MorseTwist Drill Bittwist drill bits
97,818Dec. 14, 1869S. ScholfieldImprovement in Twist-Drillstwist drill bits
112,115Feb. 28, 1871T.V. BoydenTwist Drill Bittwist drill bits
118,178Aug. 22, 1871B. ArnoldImprovement in Twist-Drillstwist drill bits
164,999Jun. 29, 1875G.L. HoltTwist Drill for Woodtwist drill bits
183,798Oct. 31, 1876A.F. ChamplinImprovement in Tools for Sharpening Drillsbench or pedestal grinders
189,265Apr. 03, 1877J.C. RichardsonImprovement in Gimlets and Twist-Drillsmaking drills and augers
228,421Jun. 01, 1880L. Thuston"Brad-Point" Bittwist drill bits
245,106Aug. 02, 1881M.S. WellerTapered Twist Drill Bittwist drill bits
318,322May 19, 1885W.E. TaftMachine for Making Drill-Blanksmaking drills and augers
326,297Sep. 15, 1885W.B. KennedyCombination-Toolcombination tools
341,084May 04, 1886F.E. WhitneyManufacture of Twist-Drillsmaking drills and augers
381,092Apr. 10, 1888J. SwanMachine for Grooving Bit-Blanksmaking drills and augers
430,299Jun. 17, 1890J.R. RandCenter Boring and Marking Tooltwist drill bits
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