Appeal No. 2004-1869
Application No. 09/738,591
applying polar titanium dioxide (titania) particulates alone, or in combination with silica, to fins
of a heat exchanger to increase the wettability of the fin surface (Answer, pp. 6, 11).
Appellant argues that Kaneko teaches that the silanol groups of the silica particulates
provide a hydrophilic surface and that titanium dioxide particulates would not have such silanol
groups (Brief, p. 6).
We agree with the Examiner’s findings and conclusions that while the titanium dioxide
particulates do not contain silanol groups, the prior art recognizes that titanium dioxide performs
the same function for the same application.
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