ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,492,301, issued on Dec. 9, was assigned to GOERTEK INC. (Weifang, China).
"Diaphragm and sound generating device" was invented by Fuzhen Yan (Shandong, China), Weichao Wang (Shandong, China) and Chun Li (Shandong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a diaphragm and a sound generating device. The raw material of the diaphragm comprises a liquid diene-based rubber and a vulcanizing agent, and the liquid diene-based rubber comprises a liquid butadiene-based rubber or a liquid isoprene-based rubber. The diaphragm is prepared by injecting the raw material into a diaphragm forming mold and then performing a cross-linking reaction....