ALEXANDRIA, Va., June 16 -- United States Patent no. 12,304,802, issued on May 20, was assigned to CHONGQING LIDONG TECHNOLOGY Co. LTD (Chongqing, China).
"Refueling gun" was invented by Zhongbing Zhu (Chongqing, China) and Guolin Lu (Chongqing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A refueling gun comprises a housing, a valve rod, and a handle. A pump body is provided within the housing, the pump body is connected to an oil intake pipe and an oil outlet pipe, and a first check valve is provided within the oil intake pipe; an end portion of the valve rod located in the pump body is connected to a negative pressure generating assembly comprising a disk, a plurality of limiting members, and a se...