ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,440,879, issued on Oct. 14, was assigned to HITACHI LTD. (Tokyo).
"Wire drawing method and wire drawing device" was invented by Younjeong Hong (Tokyo) and Chengting Hsieh (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wire drawing method includes: preparing a first wire rod that includes a first pipe having a first longitudinal length and a second pipe having a second longitudinal length different from the first longitudinal length; creating a second wire rod that includes the first pipe having a third longitudinal length and the second pipe having a fourth longitudinal length different from the third longitudinal length, by reducing a cross-se...