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:
May. 05, 1992
Filed:
May. 24, 1991
Kazuo Toyoda, Osaka, JP;
Masao Maeda, Osaka, JP;
Showa Aluminum Corporation, Osaka, JP;
Abstract
An aluminum material for use as an electronic material is produced by a method comprising the steps of melting aluminum inevitably containing U and Th to obtain molten aluminum, holding the molten aluminum heated at a temperature above the solidification temperature thereof, and immersing a hollow rotary cooling member in the molten aluminum and rotating the cooling member in the molten aluminum while maintaining the surface of the cooling member at a temperature lower than the solidification temperature by supplying a cooling fluid to the interior of the cooling member to cause aluminum to crystallize out on the surface of the cooling member with reduced U and Th contents.