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:
Jan. 06, 2026
Filed:
Mar. 25, 2022
Nippon Piston Ring Co., Ltd., Saitama, JP;
Hiroyuki Sugiura, Saitama, JP;
Takahiro Okazaki, Saitama, JP;
NIPPON PISTON RING CO., LTD., Saitama, JP;
Abstract
A sliding member including a coating film in a sliding surface on a base material. The coating film includes, when a cross section thereof is observed by a bright-field TEM image, a laminated part configured by laminating, in a thickness direction, repeating units including black hard carbon layers and white hard carbon layers and a surface layer part composed of a white hard carbon layer provided on the laminated part. A Vickers hardness of the black hard carbon layer is within a range of 700 to 1600 HV, a Vickers hardness of the white hard carbon layer is higher than a Vickers hardness of the black hard carbon layer adjacent thereto and within a range of 1200 to 2200 HV, and a Vickers hardness of the surface layer part is lower than the Vickers hardness of the white hard carbon layer and within a range of 800 to 1200 HV.