ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,516, issued on June 24, was assigned to NIPPON STEEL Corp. (Tokyo) and NIPPON STEEL SG WIRE Co. LTD. (Tokyo).
"Damper spring" was invented by Shinya Teramoto (Tokyo), Yutaka Neishi (Tokyo), Michimasa Aono (Tokyo), Shoichi Suzuki (Tokyo) and Tatsuro Ochi (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A damper spring which has an excellent fatigue limit is provided. A chemical composition of the damper spring according to the present embodiment contains in mass %, C: 0.50 to 0.80%, Si: 1.20 to less than 2.50%, Mn: 0.25 to 1.00%, P: 0.020% or less, S: 0.020% or less, Cr: 0.40 to 1.90%, V: 0.05 to 0.60%, and N: 0.0100% or less, with the balance b...