Appeal 2007-0408
Application 10/150,014
coating system must have sufficient mechanical durability to resist
scratching and abrasion during manufacturing (Specification 2:9-3:3).
Chemical durability is also desirable where chemicals are to come into
contact with the coating system (Specification 3:11-14).
The Specification describes several coating systems containing
various dielectric and metal oxide layers which are deficient in one or more
of the desired properties (Specification 6:7-8:3). The Specification states
that in view of the prior art there exists a need in the art for a coating system
which is highly durable, and preferably is also heat treatable, has
significantly low-E qualities, and, in certain embodiments, manifests high
visible transmittances sufficient for automotive windshields (Specification
8:4-11).
The above discussion of needs is directly followed by the Summary of
the Invention which opens with the statement that generally speaking the
invention fulfills the above described needs by providing a glass article with
layers comprising (a) tin oxide, (b) titanium or nickel oxide, (c) silver, (d)
nickel oxide, (e) tin oxide, (f) titanium oxide, (g) silver, (h) nickel oxide, (i)
tin oxide, and (j) silicon nitride (Specification 8:15-9:12). This is the
broadest description of the invention in the specification. There is a further
disclosure of dividing layer (e) and adding another layer of silicon nitride
(Specification 10:3-8). This twelve layer arrangement including (e1), (m),
and (e2) is shown in Fig. 1A. While other layers can be added (Specification
28:10-15), there is no disclosure of subtracting any of the layers (a) through
(j), nor is there any disclosure of substituting other dielectric or metal oxides
for the compounds specifically listed in (a) through (j) as set forth in the
Summary of the Invention.
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