Appeal 2007-1381
Application 10/686,069
I. BACKGROUND
The invention relates to a glass forming tube. Claim 5 is illustrative
of the subject matter on appeal:
5. A glass forming tube about which newly formed and coated glass
fiber is wound to form a cake of glass fiber, the forming tube comprising:
a plurality of paperboard plies spirally wound one upon another about
an axis of the forming tube and adhered together to form a tubular body
wall, the paperboard plies being free of silicone coating, wherein at least an
outermost one of the plies comprises paperboard treated with a sizing
compound so as to render the paperboard substantially impervious to liquid
coating composition applied to the glass fiber but pervious to vapors
generated during curing and drying of a cake of glass fiber.
The Examiner relies on the following prior art references to show
unpatentability:
McClellan US 4,026,690 May 31, 1977
Von Hoessle US 5,710,853 Jan. 20, 1998
Pauley US 6,165,321 Dec. 26, 2000
Specifically, the Examiner rejects claim 5 under 35 U.S.C. § 103(a) as
unpatentable over McClellan in view of Von Hoessle and Pauley.
II. DISCUSSION
A. Issue
The issue before us is: Has the Examiner properly established a prima
facie case of obviousness within the meaning of 35 U.S.C § 103(a)?
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