Appeal 2007-1169
Application 09/850,857
18) Parker teaches that it was known in the art that chlorinated PVC
(“CPVC”) possesses excellent heat distortion characteristics. (Id. at col. 1,
ll. 7-11).
4. Greenlee, U.S. Patent 5,248,546
19) Greenlee teaches that CPVC and blends of CPVC and PVC exhibit a
suitable heat distortion temperature range for multilayer articles. (Greenlee,
Abstract and col. 20, ll. 54-61).
C. Examiner’s Answer
20) The Examiner found that Heilmayr teaches all material limitations of
Applicant’s claims 1, 3, 5, and 7, except for the use of an impact modifier in
the outer layers. (Answer 3-4).
21) The Examiner found that Lause teaches that impact modifiers, such as
chlorinated polyethylene and acrylic copolymers, are known in the panel and
siding art to improve impact resistance. (Answer 5).
22) The Examiner implicitly found that Heilmayr teaches all material
limitations of claim 8, except for the use of inexpensive scrap material, such
as regrind materials. (Answer 5).
23) The Examiner found that Heilmayr and Lause fail to teach a center
layer comprised of high heat distortion polymers but that one of ordinary
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