ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,462,840, issued on Nov. 4, was assigned to SONY GROUP Corp. (Tokyo).
"Magnetic recording medium and cartridge" was invented by Noboru Sekiguchi (Tokyo), Minoru Yamaga (Tokyo) and Futoshi Sasaki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetic recording medium sequentially includes a base, an underlayer, and a magnetic layer. The magnetic layer includes magnetic particles, conductive first particles, and second particles having a Mohs hardness of 7.0 or more. The magnetic layer has a concavoconvex shape on a magnetic surface, and the concavoconvex shape includes a first protrusion including the first particles and a second protrusion inclu...