ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,502,019, issued on Dec. 23, was assigned to Guangdong RAEX Intelligent Technology Co. Ltd (Foshan, China) and GUANGDONG WINTOM SUN-SHADE TECHNOLOGY Co. LTD (Guangzhou, China).

"Telescopic curtain guide rail" was invented by Fenjiang Zhu (Guangzhou, China), Jinbin Tan (Guangzhou, China) and Yusheng Li (Guangzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A telescopic curtain guide rail includes an inner rail, an outer rail and a transmission unit. The inner rail is embedded in the outer rail, the transmission unit includes a driving wheel connected with a motor, a driven wheel, two fixed pulleys and a conveyor belt. The driving wheel and the d...