ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,542,227, issued on Feb. 3, was assigned to TDK Corp. (Tokyo).
"R-T-B based permanent magnet" was invented by Kenichi Suzuki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A permanent magnet contains main phase grains. The main phase grains include Nd, Fe, and B. In a cross-section of the permanent magnet, voids are formed. The cross-section is approximately parallel to an easy magnetization axis direction of the permanent magnet. An area ratio of the voids in the cross-section is from 1% to 5%. A direction orthogonal to the easy magnetization axis direction in the cross-section is expressed as AB direction. A direction in which each of the voids e...