ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,729,511, issued on Sept. 8, was assigned to Kubota Corp. (Osaka, Japan).
"Electric working machine" was invented by Takuma Sai (Sakai, Japan), Kiyoshi Matsui (Sakai, Japan) and Junki Ito (Sakai, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric working machine includes an electric motor to use electric power received from a battery via an inverter to drive a hydraulic pump to deliver hydraulic fluid to actuate a hydraulic device. A controller to control driving of the inverter and the electric motor is configured or programmed to gradually increase a rotation speed of the electric motor such that the rotation speed of the electric motor r...