E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/72
E21B 10/00 (2006.01)
Patent
CA 1082169
Abstract of the Disclosure A specially shaped insert of the type used for the cutter teeth of rock bits used in drilling soft and medium formations of the earth. The insert is generally chisel- shaped with flanks converging to a crest. The flanks are asymmetrical with respect to each other. The leading flank is scoop-shaped and the trailing flank is rounded outwardly. -2-
302853
Gowling Lafleur Henderson Llp
Hughes Tool Company
LandOfFree
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