Ex parte KUBO et al. - Page 4
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Board of Patent Appeals and Interferences > 2001 > Ex parte KUBO et al. - Page 4
Appeal No. 2000-1564
a specified liquid impregnate ratio or a specified beating
degree having a different recited value than that of the dense
Mizutani discloses (page 3, lines 47-54):
The separator according to the present invention
can be manufactured by blending a cellulosic fiber
and a fine-denier synthetic fiber and forming the
mixture into a sheet or web. As an alternative,
using a papermaking machine having two or more wire
cloths, a separator can be manufactured by forming
two or more webs and pressing them into a unit by
means of the couch roll of the machine. When a
fine-denier synthetic fiber is spread on one of the
wire cloths to make a high-density, void lean web
and a cellulosic fiber on the other wire cloth to
form a low-density highly liquid-absorbent web and
the two webs are pressed together, a separator
having different characteristics on the face and
reverse sides can be manufactured.
Thus, Mizutani discloses a single layer separator paper having
both cellulosic and synthetic fibers, and a double layer
separator paper wherein one layer has only cellulosic fibers
and the other layer has only synthetic fibers.
Hayashi discloses a single layer separator paper
containing both cellulosic fibers and synthetic fibers (col.
7, lines 54-60; col. 9, lines 19-24).
Kubo discloses a separator paper containing both
cellulosic fibers and synthetic fibers and teaches that the
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Last modified: November 3, 2007