ALEXANDRIA, Va., July 23 -- United States Patent no. 12,364,881, issued on July 22, was assigned to CHANGZHOU SHINE SCIENCE & TECHNOLOGY Co. LTD. (Changzhou, China).

"Method and system for controlling pressure in mask, and respirator" was invented by Liang Chen (Changzhou, China), Dong Liang (Changzhou, China) and Hongjun Zhao (Changzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to respirator technology, in particular to a method and system for controlling the pressure in a mask, and a respirator. The method comprises: arranging a fan on a mask, wherein the fan, after being started, continuously supplies air into the mask; determining a correlation between a fan speed, a pre...