ALEXANDRIA, Va., March 17 -- United States Patent no. 12,578,004, issued on March 17, was assigned to HITACHI ASTEMO LTD. (Ibaraki, Japan).
"Shock absorber" was invented by Hirohito Ishii (Hitachinaka, Japan), Takao Nakadate (Hitachinaka, Japan), Osamu Yuno (Hitachinaka, Japan) and Yuta Yamaguchi (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A shock absorber is configured in such a manner that a flow passage area of each of first orifices 169 and 189 is smallest throughout a communication passage that establishes communication between a chamber 2A or 2B on an upstream side and a chamber 2B or 2A on a downstream side, and therefore prevents a pressure in a back-pressure chamber 55 or 26 f...