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:
Mar. 23, 1976
Filed:
Apr. 21, 1975
William A Anderson, Pittsburgh, PA (US);
Ralph W Rogers, Jr, New Kensington, PA (US);
William D Vernam, New Kensington, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
An improved automotive bumper or bumper back-up bar is provided in an aluminum alloy containing selected amounts of zinc and magnesium with a small amount of zirconium and copper, with small amounts of chromium and manganese being optional but preferred. Copper is included to enhance strength. The alloy can contain 5.5-9% Zn, 0.8-2% Mg, 0.11-0.25% Cu, 0.05-0.2% Zr, and preferably 0.05-0.35% Mn or 0.05-0.25% Cr, or both. The alloy products contemplated include shaped sheet and extrusion bumper products. The improved method contemplates homogenization at a controlled temperature and control of subsequent thermal exposure to, in cooperation with the homogenization, assure good performance from the standpoint of both strength and resistance to stress corrosion cracking.