The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2024
Filed:
Jun. 22, 2023
Applicants:
Uacj Corporation, Tokyo, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventors:
Kotaro Kitawaki, Tokyo, JP;
Ryo Sakamoto, Tokyo, JP;
Wataru Kumagai, Tokyo, JP;
Hideyuki Hatakeyama, Tokyo, JP;
Ryohei Yamada, Tokyo, JP;
Shinpei Todo, Tokyo, JP;
Toshihiro Nakamura, Tokyo, JP;
Assignees:
UACJ CORPORATION, Tokyo, JP;
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/73 (2006.01); G11B 5/84 (2006.01); G11B 5/858 (2006.01);
U.S. Cl.
CPC ...
G11B 5/73919 (2019.05); G11B 5/8404 (2013.01); G11B 5/858 (2013.01);
Abstract
An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less.