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. 29, 1987
Filed:
Mar. 17, 1986
Applicant:
Inventors:
Sergej-Tomislav Buljan, Acton, MA (US);
J Gary Baldoni, Walpole, MA (US);
Assignee:
GTE Laboratories Incorporated, Waltham, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 57 ; 175410 ; 428552 ;
Abstract
A coated insert for such drilling tool bits as mine tool roof bits or masonry drill bits. A hard, fracture resistant substrate is coated with one or more thin adherent layers of refractory coating material. The material of each layer is a carbide, nitride, or carbonitride of titanium, hafnium, vanadium, tantalum, or niobium, or an oxide of aluminum or zirconium or a mixture or solid solution of these compounds. Methods for drilling holes in a mine roof or other hard materials are also disclosed.