ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,520,978, issued on Jan. 13.
"Air flow channel switching structure" was invented by Yong Yang (Hunan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An air flow channel switching apparatus includes a housing. A front end of the housing is provided with air inlet and outlet. An interior of the housing is provided with a blower assembly and an vacuum assembly. One sides of the blower assembly and the vacuum assembly are provided with at least one group of air duct switching assembly. The air duct switching assembly includes a mounting bracket, a pipe connector, a flexible hose, and a rotating assembly."
The patent was filed on April 24, 2023, under ...