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. 12, 2025
Filed:
May. 21, 2021
Sumitomo Electric Hardmetal Corp., Itami, JP;
Susumu Okuno, Itami, JP;
Takato Yamanishi, Itami, JP;
Masahito Hikiji, Itami, JP;
Fumiyoshi Kobayashi, Itami, JP;
SUMITOMO ELECTRIC HARDMETAL CORP., Itami, JP;
Abstract
A cutting tool includes a substrate and a coating provided on the substrate, the coating including: a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer; in which a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at % or more and 10.5 at % or less, and a content of nitrogen in the non-interface region is 0 at % or more and 0.15 at % or less; and the titanium compound layer comprises a layer of titanium carbonitride adjacent to the first alumina layer.