ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,352, issued on April 15, was assigned to SCHLUMBERGER TECHNOLOGY Corp. (Sugar Land, Texas).
"Hydraulic trigger with locked spring force" was invented by Bo Chen (Houston), Brian Walther (Missouri City, Texas) and Rannie Dong (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system includes a compression spring having a latch sleeve, a piston rod including a groove section, and a ratchet assembly that progressively moves the piston rod in a downward direction. A latch collet on the latch sleeve sits on the groove section of the piston rod in a first position of the system. The latch collet locks a spring force of the compression spring as the ...