ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,813, issued on June 17, was assigned to LIM-TEC (LANGFANG) TRANSMISSION EQUIPMENT Co. LTD. (Langfang, China).
"Multistage electric cylinders" was invented by Ji Guo (Langfang, China) and Ziming Meng (Langfang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a multistage electric cylinder. The multistage electric cylinder includes a cylinder barrel, a linear motion component. The linear motion component is axially movable in the cylinder barrel and includes a first screw rod; a second screw rod which is sleeved on the first screw rod; a screw rod nut which is installed on the second screw rod; an immovable tube w...