ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,544,911, issued on Feb. 10, was assigned to RIVERFIELD INC. (Tokyo).
"Arm structure" was invented by Kotaro Tadano (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An arm structure includes a shoulder joint, an elbow joint, a wrist joint, a first connection structure connecting the shoulder joint with the elbow joint and that relatively moves while maintaining an orientation of the elbow joint relative to the shoulder joint, a second connection structure connecting the elbow joint with the wrist joint and that relatively moves while maintaining an orientation of the wrist joint relative to the elbow joint, a third connection structure connecting th...