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:
Aug. 20, 2002
Filed:
Sep. 06, 2001
Applicant:
Inventors:
Terry R. Matthias, Upton St. Leonards, GB;
Nigel Dennis Griffin, Nympsfield, GB;
Peter Raymond Hughes, Stroud, GB;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21K 5/04 ; E21B 1/000 ;
U.S. Cl.
CPC ...
B21K 5/04 ; E21B 1/000 ;
Abstract
A method for use in designing rotary drill bits comprises determining locations in which cutters are to be provided, determining likely wear rates for cutters positioned at those locations, and using the likely wear rates to chose between relatively high and relatively low wear rate cutters for each location. The cutters all have substantially the same impact toughness.