Appeal No. 2005-1579 Page 8
Application No. 09/963,625
when the alloy to be oxidized, including an AlMg alloy, is made
starting with a relatively pure aluminum. See column 2, lines
20-28 of Gillich.
While the examiner does not rely on Komatsubara in rejecting
representative claim 1, appellants assert that Komatsubara
teaches that anodizing aluminum alloys with magnesium contents,
as here claimed, result in grey or black coatings while employing
a temperature within the claimed range, a sulfuric acid
concentration of 15 percent and a current density of 19.9 A per
square foot (a value above the claimed maximum of 10 A per square
foot).
We are not convinced by appellants’ assertion (reply brief,
page 2) that Komatsubara suggests that one of ordinary skill in
the art would not expect that a clear coating can be obtained
when using an alloy containing more than three weight percent
magnesium and employing current densities within the range taught
by Korte. In this regard, Korte teaches current densities both
within and outside appellants’ claimed range and appellants
appear to be trying to establish the criticality of current
density in obtaining a clear anodized coating to rebut any
obviousness based on the overlapping ranges of current density
taught by Korte. We are not persuaded.
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