Appeal No. 95-3119 Page 16
Application No. 08/089,810
Rosa discloses a counter-current recirculating device for
the exchange of heat between a gas and a finely granulated
material. As shown in Figure 1, the counter-current
recirculating device includes a number of gas ducts 1-5 connected
by arcuate members 10, 14, 18 and 22 to form a closed system.
Gas enters the duct 1 through tube 26 and leaves duct 5 through
tube 33. Each gas duct 1-5 is provided with an oblique sieve 12,
16, 20, 24, or 28. Each sieve consists of flat rails arranged
under an angle and overlapping each other in the direction of the
flow gas.
The examiner determined (answer, p. 8) that it would have
been obvious to one of ordinary skill in the art at the time of
the appellant's invention to modify Stewart's passage 28 to be a
plurality of passages one above another, especially in view of
Rosa's use of slots between the rails of each sieve.
We do not agree.
We agree with the appellant's argument (brief, pp. 11-14)
that there is no reason for one of ordinary skill in this art to
modify Stewart's passage 28 to be a plurality of passages one
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