ALEXANDRIA, Va., June 12 -- United States Patent no. 12,295,541, issued on May 13.
"Change-over valve and vacuum cleaner" was invented by Liang Cai (Beijing).
According to the abstract* released by the U.S. Patent & Trademark Office: "A changeover valve includes: a valve body and an internal-communication air duct and a driving device arranged in the valve body; wherein the valve body is connected with a housing of a vacuum cleaner, the housing is provided with a ventilation opening, an air inlet duct for driven inlet air and an air outlet duct for driven outlet air, the ventilation opening is provided with a filter element, a first end of the internal-communication air duct is connected with the ventilation opening, an outer side of the ...