ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,321, issued on April 15, was assigned to NSK LTD. (Tokyo).
"Ball screw device" was invented by Ryo Segawa (Fujisawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The ball screw device has a nut having a guide concave groove on the outer-circumferential surface capable of engaging with a rotation restraining member in the circumferential direction, a housing provided with an insertion hole having a retaining concave groove on the inner-circumferential surface capable of engaging with the rotation restraining member in the circumferential direction, the rotation restraining member configured by a shaft-shaped member extending in the axial direc...