Appeal 2007-4227
Application 10/409,417
The technique of deposition by pyrolysis is advantageous
because it makes possible the continuous deposition of the
coating directly on the float glass strip, when a glass substrate is
used.
(Chopin at 7:50–59.)
27. According to Chopin, "it can be advantageous to subject the coating,
after having deposited it, to at least one heat treatment of the annealing
type." (Chopin at 10:1–3.)
28. More specifically, "[t]his annealing generally consists in introducing
the substrate into an oven at a temperature of approximately 500 to 550°C
[932–1022°F] for a period of time which can range from 1 minute to 3
hours." (Chopin at 10:21–24.)
29. Chopin provides Examples 3 to 7 in which dispersions of titanium
dioxide particles are deposited on a substrate by pyrolysis. (Chopin at 16:36
to 19:6.)
30. The substrates are said to be 50 mm squares of clear soda-lime-silica
glass that are heated in an oven to a temperature of 400 to 650°C [752 to
1202°F] and then moved "at a constant rate in front of a movable nozzle
projecting an appropriate solution." (Chopin at 16:40–55.)
31. The "appropriate solutions" comprise, e.g., titanium diisopropoxy-
diacetylacetonate, titanium tetraoctylene glycolate, and organic solvents.
(Chopin at 16:60–67.)
32. According to Chopin, the pyrolyses were conducted at about 500°C
[932°F], and the liquid mixtures, which were held at room temperature, were
projected with compressed air. (Chopin at 17:18–21.)
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