Metal treatment – Stock – Aluminum base
Reexamination Certificate
2011-01-25
2011-01-25
Ward, Jessica L (Department: 1735)
Metal treatment
Stock
Aluminum base
C148S417000, C148S418000, C148S549000, C148S550000, C148S552000
Reexamination Certificate
active
07875133
ABSTRACT:
High temperature heat treatable aluminum alloys that can be used at temperatures from about −420° F. (−251° C.) up to about 650° F. (343° C.) are described. The alloys are strengthened by dispersion of particles based on the L12intermetallic compound Al3X. These alloys comprise aluminum, copper, magnesium, at least one of scandium, erbium, thulium, ytterbium, and lutetium; and at least one of gadolinium, yttrium, zirconium, titanium, hafnium, and niobium. Lithium is an optional alloying element.
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Kinney & Lange , P.A.
Polyansky Alexander
United Technologies Corporation
Ward Jessica L
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