ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,781,318, issued on Nov. 3, was assigned to TOKUSEN KOGYO Co. LTD. (Ono, Japan).
"Oil ring wire" was invented by Kei Otani (Kobe, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An oil ring wire (2) contains an alloy steel as a material. The alloy steel contains: 0.50 to 0.65% by mass C; 1.60 to 2.30% by mass Si; 0.60 to 1.10% by mass Mn; 0.75 to 1.15% by mass Cr; 0.18 to 0.45% by mass Ni; 0.05 to 0.15% by mass V; 0.15% by mass or less Cu; and inevitable impurities. In the oil ring wire (2), an area percentage of a carbide is more than 6.0% and 10.0% or less. Also disclosed is a method of producing the oil ring wire."
The patent was filed on Dec. 27...