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. 23, 1989
Filed:
Aug. 06, 1987
Applicant:
Inventor:
Melvin H Brown, Leechburg, PA (US);
Assignee:
Aluminum Company of America, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C22F / ;
U.S. Cl.
CPC ...
148 / ; 148159 ; 148417 ;
Abstract
The method of thermally treating an article composed of an alloy consisting essentially of aluminum, 4 to 8% zinc, 1.5 to 3.5% magnesium, 1 to 2.5% copper, and at least one element selected from the group consisting of 0.05 to 0.3% chromium, 0.1 to 0.5 manganese, and 0.05 to 0.3% zirconium, which method includes the steps of solution heat treating the article, then precipitation hardening the article at 173.degree. to 325.degree. F., then subjecting the article to a time and temperature within the perimeter ABCD of FIG. 4, and then again precipitation hardening at 175.degree. to 325.degree. F.