ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,987, issued on Sept. 23, was assigned to BRIDGESTONE Corp. (Tokyo).
"Hydraulic actuator" was invented by Shingo Oono (Tokyo) and Shungo Fujita (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydraulic actuator includes a tube capable of being expanded and contracted by fluid pressure, a sleeve covering the tube, a pair of sealing members that seal both ends of the tube in an axial direction thereof, and plural inner pieces aligned inside the tube so as to be adjacent to each other. The plural inner pieces include a restraint side where adjacent inner pieces are in contact with each other in the tube whose inside is not pressurized by the fl...