The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1998
Filed:
Mar. 15, 1996
Terry R Matthias, Longlevens, GB;
Camco Drilling Group Limited, Stonehouse, GB;
Abstract
A cutter for a rotary drill bit comprises a cutting table of superhard material bonded to a less hard substrate, the cutting table having a front face and a peripheral edge at least a part of which defines a convexly curved cutting region. The substrate includes a portion which increases in lateral extent beyond the curved cutting region of the peripheral edge of the cutting table as it extends rearwardly . The rearward extent of the outer surface of said portion varies around the periphery of the cutting table, from a maximum adjacent the cutting region to a minimum diametrically opposite the cutting region. This renders the cutter more resistant to impact loads in the cutting region while, at the same time, allowing the opposite side of the cutter to be firmly mounted in a socket in the body of the drill bit.