ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,219, issued on April 21, was assigned to FOSITEK Corp. (New Taipei City, Taiwan).

"Roller screw bidirectional and alternated preloading structure with built-in metal springs" was invented by Chun-Han Lin (New Taipei City, Taiwan), Yung-Chih Tseng (New Taipei City, Taiwan), Zoen Ryon Ryan Wong (New Taipei City, Taiwan) and Po-Yun Chen (New Taipei City, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A roller screw bidirectional and alternated preloading structure includes a screw, a nut fitted around the screw, a roller unit including first and second rollers alternately arranged between and meshing with the screw and the nut, two preload main...