ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,594, issued on May 13, was assigned to KURARAY Co. LTD. (Kurashiki, Japan).
"Double rope structure" was invented by Kazumasa Kusudo (Okayama, Japan), Satoshi Katsuya (Okayama, Japan), Yoshifumi Aso (Okayama, Japan) and Shuhei Yorimitsu (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a double rope structure which is provided with an inner core and an outer cover. In the double rope structure, the inner core includes high strength and high modulus fibers with a yarn tenacity of 20 cN/dtex or higher and a yarn elastic modulus of 400 cN/dtex or higher, and has a ratio of yarn length/rope length of 1.005 or more and 1.200 or less...