ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,444, issued on April 15, was assigned to DAIKIN INDUSTRIES LTD. (Osaka, Japan).
"Refrigeration cycle device" was invented by Kazushi Hisayama (Osaka, Japan), Kebi Chen (Osaka, Japan) and Tetsuya Okamoto (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A refrigerant circuit includes a first compressor, a second compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger. The refrigerant circuit is capable of performing a single-stage compression operation in which one of the first compressor and the second compressor is driven and the other is stopped, and a two-stage compression operation in which ...