Appeal 2007-1169
Application 09/850,857
5) Heilmayr teaches that the three-layer extrusion employs a main
extruder for a central synthetic resin stream, such as foamed PVC, and a pair
of extruders connected to the flow block for providing synthetic resins, such
as filled PVC. (Id. at col. 2, ll. 5-14).
6) Heilmayr states that the advantages of the flow block system is that it
provides a three-member construction that is simple and economical in
design. (Id. at col. 2, ll. 28-31).
7) Heilmayr teaches that its three-layer product can be siding having
strong outer layers and a foamed-core center layer where the resulting
product is strong, low-cost, low-weight and of high uniformity. (Id. at col.
2, ll. 32-34).
8) Heilmayr’s middle layer has a thickness ranging from 0.02 to 0.03
inches and the upper and lower layers range in thickness from 0.005 to 0.1
inches. (Id. at col. 2, ll. 35-39).
2. Lause, U.S. Patent 5,633,063
9) Lause is directed to a building panel and method of forming it.
(Lause, Abstract).
10) Lause states that its panel includes inner and outer polymer facing
sheets that are joined securely together to form a rigid foam core. (Id.).
7
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