ALEXANDRIA, Va., March 17 -- United States Patent no. 12,576,500, issued on March 17, was assigned to MAKITA Corp. (Anjo, Japan).

"Electric power tool, and method for controlling motor in electric power tool" was invented by Yuki Hayashi (Anjo, Japan) and Itsuku Kato (Anjo, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "One aspect of the present disclosure provides an electric power tool including a motor, a drive circuit, a voltage detector, a first calculator, and a second calculator. The drive circuit applies a power-supply voltage to the motor in accordance with a first duty ratio. The voltage detector detects a magnitude of the power-supply voltage. The first calculator calculates a desired duty r...