Appeal No. 2002-2274
Application No. 08/387,158
a coarse columnar crystal to a fine particle-shaped crystal, and
makes the elution of the alloy uniform, so that pitting
corrosion, groove corrosion and attachment of corrosive products
are prevented.
JP ‘128 discloses an aluminum alloy sacrificial anode
containing zinc and indium and teaches that 0.05-0.3 wt% Si
increases the quantity of electricity generated, and that 0.005-
0.1 wt% Ti or 0.001-0.02 wt% B changes the crystal structure from
a coarse columnar crystal to a fine particle-shaped crystal,
wherein the dissolve-out of alloy becomes uniform, and prevents
pitting corrosion, groove corrosion and adherence of corrosive
products (pages 5-7).
JP ‘683, JP ‘637 and JP ‘128 would have fairly suggested, to
one of ordinary skill in the art, including Ti, B, Si and Zr in
Linder’s alloy to obtain the disclosed benefits of these
components.
The appellants argue that JP ‘683, JP ‘637 and JP ‘128 do
not cure the deficiency in Linder in that these references do not
teach or suggest, in combination, about 20 to about 50 wt% zinc
and from 0.11 to about 0.6 wt% indium (brief, page 20). Linder,
however, discloses that the alloy can contain about 20 wt% zinc
(col. 1, lines 23-24). As discussed above regarding the
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