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:
Sep. 19, 1989
Filed:
Apr. 25, 1988
Applicant:
Inventors:
Robert F Kane, Houston, TX (US);
Joseph J Portugal, Spring, TX (US);
Pual S Kuzniar, Spring, TX (US);
Assignee:
Sandvik Rock Tools, Inc., Bristol, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21K / ; F21B / ;
U.S. Cl.
CPC ...
7610 / ; 76DI / ;
Abstract
A rock drilling bit comprises a steel body defining a cutting face with hard material inserts press-fitted into preformed openings in the cutting face. The inserts have ends extending outwardly of the cutting face which perform the actual drilling or cutting operation. The face surface of the body is case hardened except for narrow continuous bands about each insert opening. A method particularly suited for forming the case hardened cutting face is also disclosed.