Appeal 2007-4227
Application 10/409,417
14. In embodiments, the titania layer is said to be "photoactive," by which
is meant that an electron-hole pair is generated by illuminating the surface
with an appropriate wavelength of light. (417 Application at 8, ¶ 21.)
15. The 417 Application states that the photoactive surfaces may be
"photocatalytic," in that they may be self-cleaning: upon exposure to light,
organic materials on the surface may be catalytically degraded.
(417 Application at 9, ¶ 21.)
16. It is also taught that photoactive titania layers may be
"photohydrophilic" in that the contact angle with water may decrease with
increasing exposure to light. (417 Application at 9, ¶ 21.)
17. According to the inventors, a monoclinic vanadium-doped titania film
is photohydrophilic, but not photocatalytic, when exposed to UV radiation.
(417 Application at 15, ¶ 34.)
18. Upon conversion to predominately anatase form by annealing at
900°F (482°C) for 30 minutes, the vanadium-doped titania film is said to
become photocatalytic as well as photohydrophilic. (417 Application at 15,
¶ 34.)
19. The 417 Application shows that the monoclinic-to-anatase
transformation can be followed by x-ray analysis as presented in Example 3.
(417 Application at 17–18, ¶¶ 42-43, and Figure 4.)
Chopin
20. Chopin relates to substrates having a coating based on titanium
dioxide that have good photocatalytic properties as well as being durable,
transparent, and capable of being prepared industrially. (Chopin at 2:7–11.)
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