ALEXANDRIA, Va., May 5 -- United States Patent no. 12,618,224, issued on May 5, was assigned to Yanmar Holdings Co. Ltd. (Osaka, Japan).
"Electric work machine" was invented by Hiroyuki Muraoka (Fukuoka, Japan) and Mitsuyuki Hatanaka (Fukuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydraulic excavator as an electric work machine includes: an electric motor; a battery unit that stores electric power for driving the electric motor; a hydraulic oil tank that contains hydraulic oil, and a hydraulic pump that is driven by the electric motor and connected to the hydraulic oil tank. The electric motor, the hydraulic pump, and the hydraulic oil tank are arranged below the battery unit on a machine bo...