ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,501,220, issued on Dec. 16, was assigned to Foster Electric Co. Ltd. (Tokyo).
"Speaker and method of producing the same" was invented by Eiichiro Suzuki (Tokyo) and Yusuke Yoshizawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker includes: an edge having an outer circumference attached on an edge mounting portion of a resin frame by a resin ring provided on a front surface of the outer circumference. Interposed between the edge mounting portion and the resin ring is a projection-like energy director having a part abutting on one of the members and being melted from the part by ultrasonic waves."
The patent was filed on Sept. 24, 2021, u...