Appeal No. 2004-2292
Application No. 09/747,537
crystallinity of the core layer and a resulting film with improved tear
resistance.
We also note that the Keller reference differs from the claimed
invention in that Keller does not include a hydrocarbon resin in the core
layer. As stated above, Schloegl describes biaxially stretched films that
comprise hydrocarbon modifiers in the core layer. The present record
indicates that persons of ordinary skill in the art would have recognized
that hydrocarbon resins are well known processing aids for polypropylene
based films which improve the physical properties of the films. Thus, it
would have been obvious to a person of ordinary skill in the art to
incorporate a hydrocarbon processing aid in the core layer of Keller in
order to obtain improved mechanical properties. The prior art must be
considered together with the knowledge of persons of ordinary skill in the
pertinent art. The prior art need not explain every detail since it is speaking
to those skilled in the art. Paulsen, supra.
The Examiner rejected claim 12 under 35 U.S.C. 103(a) over the
combination of Schloegl, Keller and Arita. We affirm.
As stated above, the Examiner relies on the Arita reference to
establish that employing low density polyethylene in the skin layer of a
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