ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,433,440, issued on Oct. 7.
"Curtain control system and curtain control method" was invented by Chung Hsien Hsieh (New Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a curtain control system and a curtain control method. When a controller receives a curtain-releasing signal, a braking module releases a curtain so as to lower it, a current position detecting module detects an absolute position of the curtain, and the controller calculates a current velocity and a current acceleration of the curtain according to a variation per unit time of the absolute position. When the current velocity is equal to zero or t...