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 9Page: Previous 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Next
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