US Patent Issued to UACJ, FURUKAWA ELECTRIC on Feb. 17 for "Magnetic disk substrate and magnetic disk using magnetic disk substrate" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,555,602, issued on Feb. 17, was assigned to UACJ Corp. (Tokyo) and FURUKAWA ELECTRIC Co. LTD. (Tokyo).

"Magnetic disk substrate and magnetic disk using magnetic disk substrate" was invented by Kotaro Kitawaki (Tokyo), Hideyuki Hatakeyama (Tokyo), Wataru Kumagai (Tokyo) and Ryo Sakamoto (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetic disk substrate includes an aluminum alloy including one type or two or more types of Fe: 8.5 mass % or less, Mn: 2.5 mass % or less, Ni: 6.5 mass % or less, and Mg: 4.5 mass % or less, a balance being Al and unavoidable impurities, wherein, when f (Hz) is a resonance frequency, Rho (g/cm3) is a density, and ...