Appeal No. 2000-0482
Application 08/569,256
[p]olytetrafluoroethylene is known as a slip
agent and lubricant and as a substance with a
release effect in many fields of use. So-
called polytetrafluoroethylene micro-powders
(also called “polytetrafluoroethylene waxes”)
are particularly preferred according to the
invention. These low-molecular-weight poly-
tetrafluoroethylenes generally have a
molecular weight of 30,000-200,000 and an
average particle size of 1 to 20 :m.
Wagner, column 2, line 66-column 3, line 6. The mineral fillers
utilized by Wagner include known slip and release agents such as
talc, kaolin and mica. Id. at column 3, lines 33-35. Wagner
further notes that the effectiveness of the PTFE can be increased
by using silicone oils. Id. at column 3, lines 23-25.
It is the examiner’s position that one of ordinary
skill in the art would have been motivated to utilize the low
molecular weight PTFE of Wagner in the compositions of Horiuchi
to obtain further improvements in release properties of the
Horiuchi composition. Appellants argue that “Horiuchi ‘235 fails
to suggest or provide motivation” to utilize the low molecular
weight PTFE disclosed in Wagner in the Horiuchi composition since
Horiuchi’s test results demonstrate that improved releasability
is not attained when PTFE is included in the composition, i.e.,
there would be no reasonable expectation of enhanced
releasability. Appeal Brief, pages 9-10. This argument is
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