Appeal No. 1997-3099
Application 08/191,886
to form an expanded, biaxially stretched, secondary tube having a continuous core layer
less than 0.10 mil in thickness; and rapidly cooling said stretched film to form a heat
shrinkable film having a total thickness of from about 1.5 to about 4.0 mils.
The reference relied upon by the examiner is:
Newsome et al. (Newsome) 4,615,922 Oct. 7, 1986
GROUND OF REJECTION
Claims 1 - 6, 9 - 56, and 65 - 73 stand rejected under 35 U.S.C. § 103. As
evidence of obviousness, the examiner relies on Newsome.
We reverse.
BACKGROUND
Applicants describe the invention at pages 10-11 of the specification, as being
directed to a multilayer film having a high carbon dioxide permeability and relatively low
oxygen permeability which is controlled by a thin core layer. The film is stated to be flexible
and having at least 5 layers wherein the core layer is about 0.05 to 0.10 mils and is a blend
of about 20 - 70 weight percent nylon and 30 - 80 weight percent of an ethylene vinyl
alcohol (EVOH) copolymer having an ethylene content of about 38 mole percent or higher.
The film is described as being useful for packaging respiring articles such as cheese.
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