ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,490,019, issued on Dec. 2, was assigned to Panasonic Intellectual Property Management Co. Ltd. (Osaka, Japan).
"Loudspeaker device" was invented by Masashi Nishida (Osaka, Japan), Kazuki Honda (Mie, Japan) and Ippei Kiyama (Hyogo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A loudspeaker device includes: a loudspeaker unit; a cabinet that includes an opening and covers the rear side of the loudspeaker unit; a bass reflex port in a tubular shape that communicates the interior with the exterior of the cabinet, and includes one end disposed in the opening of the cabinet and the other end disposed inside the cabinet; and a diffuser in the shape of a...