ALEXANDRIA, Va., July 21 -- United States Patent no. 12,690,392, issued on July 21, was assigned to SHENZHEN SHOKZ Co. LTD. (Shenzhen, China).

"Piezoelectric speakers" was invented by Guangyuan Zhu (Shenzhen, China), Lei Zhang (Shenzhen, China) and Xin Qi (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure is of a piezoelectric speaker. The piezoelectric speaker includes a plurality of piezoelectric elements and a vibration transmission plate. Each piezoelectric element is configured to generate vibration based on an audio signal. The vibration transmission plate includes a plurality of elastic rods and a mass block, and each elastic rod connects the mass block and one of t...