Appeal 2007-4227
Application 10/409,417
21. According to Chopin, these goals are met by providing a coating that
is at least partially crystalline in the anatase form. (Chopin at 2:12–17.)
22. Chopin provides a number of alternatives that are said to amplify the
photocatalytic effect of the titanium dioxide particles of the coating.
(Chopin at 4:27–35.)
23. In Chopin's words:
According to a first alternative form, at least a portion of the
titanium dioxide particles of the coating can comprise, in their
crystal lattice, metal ions chosen from iron, copper, ruthenium,
molybdenum, bismuth, tantalum, niobium, cobalt, nickel or
vanadium. The ratio of the mass of these ions with respect to
the mass of the titanium dioxide particles is generally between
0.01 and 10%.
(Chopin at 4:36–42.)
24. Chopin also teaches that the titanium dioxide surface, upon exposure
to appropriate radiation (e.g., visible or ultraviolet) "promotes the gradual
disappearance of dirty marks of organic origin, causing them to degrade by a
radical oxidation process." (Chopin at 6:36–42.)
25. In addition, Chopin states that the contact angle with water can be
reduced to 5° or less by exposing the titanium dioxide surface to light.
(Chopin at 6:43–56.)
26. Chopin discloses a method for producing substrates of the invention
that involves:
coating, by liquid-phase pyrolysis, from a dispersion
comprising at least one organometallic compound and titanium
dioxide particles, the said particles exhibiting the characteristics
of the particles incorporated in the final coating described
above.
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