Appeal No. 1999-2544 Page 15
Application No. 08/796,513
element (50), which is a flat spirally wound element, so that
if a plurality of turns of wire are partially exposed to air,
then a lesser damaging effect is given compared with a whole
turn (specification, page 6).
Lambert teaches a moisture exchange unit (12) (Fig. 1)
having helically wound paper layers (13 and 15) (Fig. 3) and a
warming device (16) of a band which includes one or more
resistor elements wound with the paper layers (col. 2, lines
65-68 and col. 3, lines 1-10).
It is the examiner's opinion that it would have been
obvious to one of ordinary skill in the art, in view of Zwaan
and Lambert, to have modified Jackson's device by providing an
electrical heating means for heating to generate vapor
pressure within the device sufficient to cause passage of
water vapor but not liquid water through the wall of the
hollow tubes (final rejection, page 4).
In response to the appellant's argument that Zwaan does
not teach direct electrical heating of the outer
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