Appeal No. 2000-1516
Application 08/897,337
range of the amounts of release agent applied with creping aids
to Yankee drums. The appellants argue that the amount of release
agent in their example 1, which is the control, is only about
0.03 wt% based upon fiber. See id.
Assuming that an amount of release agent of about 0.03 wt%
based upon fiber is a typical amount, Knight’s teachings that the
release agent has a softening effect on the web and that the
amount of release agent depends upon the degree of softness to be
obtained (col. 3, lines 15-24) would have fairly suggested, to
one of ordinary skill in the art, use of an amount of release
agent which is somewhat greater than about 0.03 wt% based upon
fiber, such as about 0.05 wt% based upon fiber (which includes
amounts below 0.05 wt%), to obtain increased softness.
The appellants argue that prior art softness gains have been
attributed to improved creping rather than to transfer of release
agent to the tissue surface (brief, page 3). This argument is
not persuasive because Knight’s teaching that the release agents
have a softening effect on the web (col. 3, lines 15-19)
indicates that the release agents are transferred to the tissue
surface to soften it.
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