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:
Dec. 24, 1991
Filed:
May. 05, 1989
Applicant:
Inventors:
Dennis T Quinto, Greensburg, PA (US);
Helmut J Kaufmann, Triesen, LI;
Assignees:
Kennametal Inc., Latrobe, PA (US);
Balzers Limited, , LI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; C23C / ; C23C / ;
U.S. Cl.
CPC ...
428698 ; 51295 ; 51307 ; 51309 ; 428212 ; 428334 ; 428469 ; 428472 ; 428688 ; 428689 ; 428699 ; 428704 ;
Abstract
A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost or first layer is composed of a group IVB (titanium, hafnium or zirconium) metal nitride. The middle or second layer is composed of a group IVB carbonitride. The outermost or third layer is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.