US Patent Issued to Hitachi Astemo on Sept. 8 for "Shock absorber" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,729,741, issued on Sept. 8, was assigned to Hitachi Astemo Ltd. (Ibaraki, Japan).

"Shock absorber" was invented by Hirohito Ishii (Hitachinaka, Japan) and Osamu Yuno (Hitachinaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention is directed to provide a shock absorber in which hydraulic fluid is restrained from leaking out from a gap between a sub-check valve provided at a passage opening of an orifice passage and a disc valve. The sub-check valve (133) is biased toward the opening (126) of the orifice passage (130) using a biasing disc (135) (biasing member) of substantially equal diameter to the sub-check valve (133). This makes it p...