ALEXANDRIA, Va., June 2 -- United States Patent no. 12,643,270, issued on June 2, was assigned to Tymphany Acoustic Technology (Huizhou) Co. Ltd. (Huizhou City, China).
"Preparation method of a passive horn" was invented by Shuhong Cen (Huizhou City, China) and Cheng Ho (Huizhou City, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A passive horn integrally formed by using liquid silicone rubber, includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groov...