ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,418,354, issued on Sept. 16, was assigned to Panasonic Holdings Corp. (Osaka, Japan).

"Radio communication device and response signal spreading method" was invented by Seigo Nakao (Kanagawa, Japan), Daichi Imamura (Saitama, Japan) and Katsuhiko Hiramatsu (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A radio communication device capable of randomizing both inter-cell interference and intra-cell interference. In this device, a spreading section primarily spreads a response signal in a ZAC sequence set by a control unit. A spreading section secondarily spreads the primarily spread response signal in a block-wise spreading code sequence s...