ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,460,476, issued on Nov. 4, was assigned to Nien Made Enterprise Co. Ltd. (Taichung, Taiwan).
"Window covering system" was invented by You-Yu Zhang (Hsinchu County, Taiwan), Chao-Hung Nien (Taichung, Taiwan) and Shih-Wei Hsu (Hsinchu County, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A window covering system and a calibration method therefor are provided for generating a safe distance between a middle rail and a lower rail according to status of a first lifting cord. The calibration method includes moving the middle and lower rails upwardly until reaching their initial positions, moving down the lower rail a predetermined distance and storing t...