US Patent Issued to TDK on Sept. 22 for "R-T-B based permanent magnet" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,744,139, issued on Sept. 22, was assigned to TDK Corp. (Tokyo).

"R-T-B based permanent magnet" was invented by Hikaru Kudo (Tokyo), Atsushi Koda (Tokyo) and Takahiro Suwa (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An R-T-B-based permanent magnet including: R (rare earth element); T (Fe and Co); B (boron); and one or more selected from Al, Cu, Ga, and Zr. R includes Ce. The total R content is 31.3-34.0 mass % (inclusive), the Co content is 1.85-3.00 mass % (inclusive), the B content is 0.80-0.90 mass % (inclusive), the Al content is 0.03-0.90 mass % (inclusive), the Cu content is 0-0.25 mass % (inclusive), the Ga content is 0-0.10 mass % (inc...