ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,469,904, issued on Nov. 11, was assigned to MURATA MANUFACTURING Co. LTD. (Kyoto, Japan).
"Flat secondary battery" was invented by Yoshiichi Horikoshi (Kyoto, Japan) and Taichi Katsumoto (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A flat secondary battery includes an outer package member, a battery device, and an electrode terminal. The outer package member has a flat and columnar shape, and includes a pair of bottom parts and a sidewall part. The bottom parts are opposed to each other. The sidewall part lies between the bottom parts. At least a portion of a surface of the sidewall part is a curved surface. The battery device is contain...