ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,526,578, issued on Jan. 13, was assigned to GOERTEK INC. (Weifang, China).
"Sound generating device" was invented by Quanquan Pan (Shandong, China), Fengguang Ling (Shandong, China) and Chun Li (Shandong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a sound generating device. The sound generating device includes a sound generating unit, a plurality of magnetic sound-absorbing particles, and a housing having a cavity, wherein the sound generating unit is accommodated in the cavity, and the sound generating unit divides the cavity into a front cavity and a rear cavity, and the magnetic sound-absorbing particles are filled in the front...