Appeal No. 1996-4176
Application No. 08/287,915
This is an appeal under 35 U.S.C. § 134 from the
examiner’s refusal to allow claims 1 through 31 and 33 through
37 which are all of the claims remaining in the application.
THE INVENTION
Appellants’ invention is directed to a lead-free aluminum
alloy, products prepared therefrom, and a method for
manufacturing the alloy products. The alloy consists
essentially of aluminum, copper, bismuth and tin in specific
quantities. Iron, silicon and zinc may be optionally present
in limited quantities.
THE CLAIMS
Claims 1 and 8 are illustrative of appellants’ invention
and are reproduced below.
1. A substantially lead-free 2000 Series aluminum alloy
consisting essentially of: about 4-5.75 wt.% copper, about
0.2-0.9 wt.% bismuth, about 0.12-1.0 wt.% tin, the ratio of
bismuth to tin ranging from 0.8:1 to 5:1, up to about 0.7 wt.%
iron, up to about 0.4 wt.% silicon, up to about 0.3 wt.% zinc,
the balance essentially aluminum with incidental elements and
impurities.
8. A substantially lead-free, cadmium-free and thallium-
free, aluminum-based alloy having good combinations of tool
wear and tool life properties, said alloy consisting
essentially of about 4-5.75 wt.% copper, about 0.2-0.9 wt.%
bismuth, about 0.12-1.0 wt.% tin, the ratio of bismuth to tin
ranging from 0.8:1 to 5:1, up to about 0.7 wt.% iron, up to
about 0.4 wt.% silicon and up to about 0.3 wt.% zinc.
2
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