US Patent Issued to NTN on Sept. 22 for "Bearing part" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,476, issued on Sept. 22, was assigned to NTN Corp. (Osaka, Japan).

"Bearing part" was invented by Chikara Ohki (Kuwana, Japan) and Masahiro Yamada (Kuwana, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A bearing part is composed of a steel, and includes a quench-hardened layer in a surface of the bearing part. The quench-hardened layer includes a plurality of martensite crystal grains. A ratio of a total area of the plurality of martensite crystal grains in the quench-hardened layer is more than or equal to 70%. The plurality of martensite crystal grains are classified into a first group and a second group. A minimum value of crystal grain s...