ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,713, issued on Nov. 18, 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, in a machine body, a battery unit that stores electric power, an electric motor that is driven by the electric power supplied from the battery unit, a hydraulic pump that is driven by the electric motor, an oil cooler that cools hydraulic oil discharged from the hydraulic pump, and a fan that draws air into the machine body. The machine body has a first ...