ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,520,953, issued on Jan. 13, was assigned to PARAMOUNT BED Co. LTD. (Tokyo).

"Air mat device and internal pressure control method of air cell" was invented by Kenta Ohno (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided an air mat device comprising a mat unit that has an air cell; an air supply and exhaust unit that supplies air to the air cell and exhausts the air from the air cell; and a control unit that acquires a state change quantity of the air cell or a time required for a state change of the air cell, as a control reference value, and that controls the air supply and exhaust unit in accordance with the control reference valu...