ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,434,952, issued on Oct. 7, was assigned to ZHEJIANG EP TECHNOLOGY Co. LTD (Hangzhou, China).
"Electric hydraulic floor jack" was invented by Yufeng He (Hangzhou, China), Jifeng Xu (Hangzhou, China) and Weixiang He (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric hydraulic floor jack includes a variable plunger structure provided on a motor base and an oil pump base. The variable plunger structure includes a piston hole formed in the oil pump base and communicating with an oil chamber and an oil inlet passage, a plunger sleeve provided at a port of the piston hole, a plunger slidably provided in the plunger sleeve, a U-shaped pi...