ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,491, issued on Feb. 17, was assigned to HITACHI ASTEMO LTD. (Ibaraki, Japan).
"Shock absorber" was invented by Mikio Yamashita (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A shock absorber includes a first passage through which a working fluid flows from one chamber in a cylinder due to movement of a piston, a second passage which is provided in parallel with the first passage, a disk which is provided in the first passage and generates a damping force, a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction, a pilot chamber which is provided in the s...