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:
May. 28, 2024
Filed:
Apr. 24, 2020
Sumitomo Electric Hardmetal Corp., Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Haruyo Fukui, Itami, JP;
Daiji Tabayashi, Itami, JP;
Yoshihiro Saito, Osaka, JP;
Kazuya Tokuda, Osaka, JP;
Yoshiharu Utsumi, Kyoto, JP;
Hajime Takamatsu, Kyoto, JP;
SUMITOMO ELECTRIC HARDMETAL CORP., Itami, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Abstract
Provided is a cutting tool that can have a long tool life even when used to cut soft metals in particular. The cutting tool comprises a base body and a hard carbon film arranged on the base body, the hard carbon film includes an amorphous phase and a graphite phase, the density of the hard carbon film is no less than 2.5 g/cmand no more than 3.5 g/cm, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the average coordination number of the amorphous phase is no less than 2.5 and no more than 4.