ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,494,749, issued on Dec. 9, was assigned to Murata Manufacturing Co. Ltd. (Kyoto-fu, Japan).
"Power amplifier" was invented by Shigeki Koya (Nagaokakyo, Japan), Shaojun Ma (Nagaokakyo, Japan) and Shinnosuke Takahashi (Yokosuka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power amplifier comprising amplifier circuits of multiple stages. Each of the amplifier circuits of multiple stages includes a bipolar transistor and a base electrode. The bipolar transistor included in each of the amplifier circuits of multiple stages includes a collector layer, a base layer placed on the collector layer, and an emitter mesa placed on part of the region of the...