UACJ and Furukawa Electric Assigned Patent

UACJ Corp., Tokyo, Japan, and Furukawa Electric Co. Ltd., Tokyo, Japan, has been assigned a patent (11,037,594) developed by Kitawaki, Kotaro, Tokyo, Japan, Yonemitsu, Makoto, Hatakeyama, Hideyuki, Nakayama, Takashi, Fujii, Yasuo, and Sakamoto, Ryo, Tokyo, Japan, for “aluminum-alloy substrate for magnetic disk, method for manufacturing same and magnetic disk employing said aluminum-alloy substrate for magnetic disk.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Provided is an aluminum alloy substrate for a magnetic disk that includes an aluminum alloy containing 0.4 to 3.0 mass % (hereinafter abbreviated as ‘%’) of Fe, 0.005% to 1.000% of Cu, and 0.005% to 1.000% of Zn, with a balance of Al and unavoidable impurities. This substrate has a ratio A/B of 0.70 or more, where A indicates a distribution density of Al–Fe intermetallic compound particles having maximum diameters of 10 .mu.m or more and less than 16 .mu.m, and B indicates a distribution density of Al–Fe intermetallic compound particles having maximum diameters of 10 .mu.m or more. The distribution density of Al–Fe intermetallic compound particles having maximum diameters of 40 .mu.m or more is at most one per square millimeter. Also provided are a method of fabricating this aluminum alloy substrate for a magnetic disk and a magnetic disk composed of the aluminum alloy substrate for a magnetic disk.”

The patent application was filed on February 6, 2019 (Appl. No.16/969,847).