The opinion in support of the decision being entered today was not
written for publication and is not binding precedent of the Board
Paper No. 23
UNITED STATES PATENT AND TRADEMARK OFFICE
____________
BEFORE THE BOARD OF PATENT APPEALS
AND INTERFERENCES
_____________
Ex parte JAMIE C. DA SILVA and
CECILIA MARIA O. DE FGUEIREDO
_____________
Appeal No. 1998-3157
Application No. 08/466,797
_____________
HEARD: JUNE 13, 2001
_____________
Before WARREN, OWENS and PAWLIKOWSKI, Administrative Patent
Judges.
PAWLIKOWSKI, Administrative Patent Judge.
DECISION ON APPEAL
This is an appeal from the examiner’s final rejection
of claim 5, the only claim remaining in the application.
THE INVENTION
Claim 5 is illustrative of appellants and is
reproduced below.
5. A process for preparing a spherical
polyethylene of ultra high molecular weight having an
internal attrition angle of from 30 to 40° using a
Ziegler-Natta catalyst system in a hydrocarbon solvent
which comprises contacting ethylene monomer with the
catalyst system in a hydrocarbon solvent and carrying
out polymerization for one to three hours in the
presence of such catalyst system at 70-85°C and an
ethylene pressure between 14 to 20 kgf/cm2, wherein the
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