ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,255, issued on Jan. 13, was assigned to NTN Corp. (Osaka, Japan).
"Rolling member and rolling bearing" was invented by Miyu Sato (Kuwana, Japan), Noriaki Miwa (Kuwana, Japan), Masahiro Yamada (Kuwana, Japan) and Chikara Ohki (Kuwana, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rolling member is formed of quenched steel having a contact surface. The rolling member includes a superficial part in a region up to a depth of 20 micro metre from the contact surface. Steel contains greater than or equal to 0.70 mass % and less than or equal to 1.10 mass % of carbon, greater than or equal to 0.15 mass % and less than or equal to 0.35 mass % of sil...