Appeal 2007-2181
Application 10/261,862
§ 134(a) of the Examiner's final rejection of claims 1-13 and 16-20. Claims
14 and 15, the only other pending claims in this Application, have been
withdrawn from consideration as being directed to a non-elected invention.
We have jurisdiction under 35 U.S.C. § 6(b). We reverse.
A. The invention
Appellants' invention is directed to a method of forming an aramid
paper/polymer/aramid paper laminate using a calendering step which allows
each opposing surface of the aramid paper to have a different porosity.
1. Appellants' specification
According to the specification, laminates of aramid paper(s) and
polymer(s) are known to be useful as dielectric insulation materials in
transformers (Specification, 1:22-24). Further according to the specification,
aramid paper can be calendered with high temperature and pressure rolls to
increase the bond strength of the paper (id., 3:29-31). However, calendering
aramid paper is said to result in decreased porosity of the aramid paper and
poorer adhesion between the aramid paper and polymer layers in laminates
(id., 3:31-33). This adhesion problem is said to be solved by a calendering
method which allows opposing surfaces of aramid paper to have a different
porosity (id., 4:2-5). The specification describes preparing an aramid paper
having a compact, denser outer surface and a more porous opposing inner
surface by calendering the two surfaces at temperatures which differ by at
least 20oC. The denser surface results from contact with the higher
temperature roll and the more porous surface results from contact with the
lower temperature roll (id., 4:2-4; 5:7-30; 6:24-28). The opposing surfaces
of the aramid paper may be calendered between heated rolls having different
temperatures or by first calendering one surface of the paper at one
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Last modified: September 9, 2013