Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Walter Hester0
Eiichi Nakanishi0
Date of Patent
April 17, 2007
0Patent Application Number
109810370
Date Filed
November 4, 2004
0Patent Primary Examiner
Patent abstract
A method and apparatus for drilling glass using a drill and drill bit. The method utilizes a drill bit having a plurality of shaft diameters, and being provided with a plurality of types of abrasives. By providing a coarser abrasive on a narrow portion of the bit, and finer abrasives on a wider portion of the bit, drilling can be accomplished while reducing the incidents of micro fracture in the glass being drilled. Providing an even narrower connection shaft between the two cutting portions of the drill bit further facilitates reduction in micro fractures created during the drilling process.
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