ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,457,456, issued on Oct. 28.
"Dual-cone loudspeaker" was invented by Jianming Zhou (Suzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a dual-cone loudspeaker, including: a frame; a cone assembly arranged on the frame and including a central cone and an outer cone; a central drive mechanism for driving the central cone to vibrate; and a plurality of outer driving mechanisms for driving the outer cone to vibrate. The outer driving mechanisms are arranged around the central drive mechanism. The central drive mechanism includes a central voice coil connected to the central cone, and a central magnetic driving system for driving the ce...