US Patent Issued to TDK on Feb. 10 for "R-T-B-based permanent magnet and method for producing same, motor, and automobile" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,548,700, issued on Feb. 10, was assigned to TDK Corp. (Tokyo).

"R-T-B-based permanent magnet and method for producing same, motor, and automobile" was invented by Yoshinori Fujikawa (Tokyo) and Reiji Yamada (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An R-T-B-based permanent magnet which contains R that represents at least one rare earth element essentially including Tb or Dy, T that represents Fe or at least one iron-group element essentially including Fe and Co, and B that represents boron, and further contains Cu. The total content of R is 28.35 to 29.95% by mass, inclusive, the content of Cu is 0.05 to 0.40% by mass, inclusive, and the con...