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:
Feb. 17, 2026
Filed:
May. 20, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Toshinori Kawamura, Tokyo, JP;
Hiroshi Kanemoto, Tokyo, JP;
Hiroshi Nakano, Hitachinaka, JP;
Akihito Hoshino, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
Provided is a shock absorber in which trivalent chromium is used to achieve both high hardness and low frictional force at a high level without using hexavalent chromium which is suspected of causing damage to the human body and the environment, and a method for manufacturing the shock absorber. A shock absorber () of the present invention includes: a cylinder () which is filled with hydraulic oil (); a piston rod () which is movable in the cylinder (); and an oil seal () which is fixed to the cylinder () and slides on the piston rod (), in which a hard layer mainly containing chromium obtained from a trivalent chromium plating bath is provided on a surface of the piston rod (), and the hard layer contains both a crystalline material and an amorphous material, and also contains an additive other than chromium.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile