Metal treatment – Stock – Age or precipitation hardened or strengthened
Reexamination Certificate
2003-10-03
2008-10-21
King, Roy (Department: 1793)
Metal treatment
Stock
Age or precipitation hardened or strengthened
C420S533000, C420S535000, C420S539000
Reexamination Certificate
active
07438772
ABSTRACT:
An aluminum-copper-magnesium alloy having ancillary additions of lithium. The alloy composition includes from about 3 to about 5 weight percent Cu, from about 0.5 to about 2 weight percent Mg, and from about 0.01 to about 0.9 weight percent Li. The combined amount of Cu and Mg is maintained below a solubility limit of the aluminum alloy. The alloys possess improved combinations of fracture toughness and strength, and also exhibit good fatigue crack growth resistance.
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Bray Gary H.
Magnusen Paul E.
Rioja Roberto J.
Alcoa Inc.
Greenberg & Traurig, LLP
King Roy
Morillo Janelle
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