Appeal No. 2001-1884
Application No. 08/718,692
strength and other properties, when compared with conventional
polyethylene.” See column 1, lines 15-20 and column 2, lines 29-
38, together with column 7, lines 18-28. This ultra-high
molecular weight polyethylene film is extruded at “[a]
temperature . . . higher than the melting point of the
polyethylene but lower than 350 oC. . . . ” See column 5, lines
20-24. “The preferable extrusion temperature conditions of the
above-mentioned ultra-high-molecular-weight polyethylene are an
extruder temperature of 200 oC. to 330 oC. . . . ” See column 5,
lines 28-31. This extrusion method alleviates certain drawbacks
associated with prior extrusion processes for producing ultra-
high-molecular-weight polyethylene films. See column 1, line
30 to column 2, line 15). Thus, we determine that the combined
teachings of Bradley and Shiraki would have led one of ordinary
skill in the art to employ the ultra-high-molecular weight
polyethylene films extruded in the claimed manner as the pre-
manufactured polyethylene film used in the process of Bradley,
motivated by a reasonable expectation of successfully obtaining
the advantages taught in Shiraki.
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