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:
Nov. 10, 2026
Filed:
Mar. 04, 2022
Hitachi Astemo, Ltd., Hitachinaka, JP;
HITACHI ASTEMO, LTD., Ibaraki, JP;
Abstract
One aspect of the present invention is configured in such a manner that a main valve (a valve member) is in abutment with only a ridge portion (a second protrusion portion) on the inner peripheral side of a seat portion (a first seat portion) in a state of being mounted on a piston. This configuration can reduce the radial contact width between the main valve and the seat portion, and contribute to preventing or reducing variations in the valve-opening point and the damping force by managing the radial dimension of the ridge portion on the inner peripheral side of the seat portion to allow the contact diameter between the main valve and the seat portion to be kept constant.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile