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:
Oct. 18, 1988
Filed:
Feb. 04, 1987
George T Gregory, Lower Burrell, PA (US);
Donald L Nock, New Kensington, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
An aluminum-magnesium alloy sheet product having improved levels of brightness for use as container stock including food containers and beverage container ends, said sheet product chemically treated with an alkaline-based cleaner containing a sufficient amount of a compound of 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) to inhibit the formation of a magnesium oxide-containing film thereon. Preferably, the sheet product is cast from a 5000 Series aluminum alloy (Aluminum Association designation) and the cleaner contains between about 0.2-0.7% by weight of the HEDP compound. A method for improving the brightness levels of an aluminum-magnesium alloy sheet product is further disclosed. The method comprises chemically treating the sheet product with an alkaline-based cleaner containing between about 0.2-0.7% by weight of an HEDP compound to inhibit the formation of a magnesium oxide-containing film thereon.