ALEXANDRIA, Va., June 5 -- United States Patent no. 12,278,620, issued on April 15, was assigned to MURATA MANUFACTURING Co. LTD. (Kyoto, Japan).
"Ladder filter and composite filter device" was invented by Sunao Yamazaki (Nagaokakyo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A ladder filter includes series arm resonators, parallel arm resonators, and first and second inductors. Second ends of the parallel arm resonators are connected in common to each other and are connected to a ground potential. A first end of each of the first and second inductors is connected to a series arm, and second ends thereof are connected in common to each other and are connected to the ground potential with a capacito...