US Patent Issued to BIBOTING INTERNATIONAL on Feb. 17 for "Ventilation switching structure of negative pressure regulator" (Taiwanese Inventor)

ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,551,684, issued on Feb. 17, was assigned to BIBOTING INTERNATIONAL Co. LTD. (Taoyuan, Taiwan).

"Ventilation switching structure of negative pressure regulator" was invented by Li-Pin Yuan (Taoyuan, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ventilation switching structure includes a valve, a switching cylinder, and a knob. The valve includes a receiving room, a main tube and branch tubes. The main tube is connected with a negative pressure instrument and connected to the receiving room. The branch tubes are located on two sides of the main tube. The switching cylinder is rotatably disposed in the receiving room and includes a main channel, ...