ALEXANDRIA, Va., July 15 -- United States Patent no. 12,666,199, issued on June 23, was assigned to FOSTER ELECTRIC COMPANY Ltd. (Tokyo).
"Speaker device" was invented by Kentaro Machida (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker device includes: a first voice coil; a second voice coil disposed radially outside the first voice coil; a first damper supporting the first voice coil to a frame; and a second damper supporting the second voice coil to the frame, and the first damper includes a recessed portion, which is separated from the second voice coil more than other portion of the first damper, on an extension line of a vibration direction of the second voice coil."
The patent was filed...