Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
David J. Wills0
Jean-Luc Dufour0
X. Daniel Fang0
Date of Patent
January 6, 2015
0Patent Application Number
131796620
Date Filed
July 11, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
One non-limiting aspect of the present disclosure is directed to a multi-piece twist drill head. The multi-piece twist drill head includes a core piece formed from a first hard material, and a peripheral piece formed from a second hard material. The core piece and peripheral piece each comprise a cutting edge and are adapted to mate to provide a central region and a peripheral region, respectively, of the multi-piece twist drill head. A twist drill including the multi-piece twist drill head is also disclosed.
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