ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,440, issued on Feb. 17, was assigned to DAIKIN INDUSTRIES LTD. (Osaka, Japan).
"Compressor and freezer" was invented by Hiromichi Ueno (Osaka, Japan), Tatsuya Katayama (Osaka, Japan), Kanetaka Miyazawa (Osaka, Japan), Masaaki Adachi (Osaka, Japan) and Yuta Yamamoto (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A compressor includes fixed and movable members with a discharge port penetrating the fixed member and a discharge valve body to open and close the discharge port. An inflow end of the discharge port has a hydraulic diameter Di=4x(Ai/Li), where Ai is an area of the inflow end and Li is a circumferential length at the inflow end....