Appeal No. 96-0019
Application 08/150,742
art. Fukino would have suggested to the artisan that the equal
emitter junction intervals of Alderstein should be varied in the
manner suggested by Fukino so as to equalize the temperature
distribution along the entire transistor. The question is
whether the claimed 50% interval change would have been obvious
to the artisan within the meaning of 35 U.S.C. § 103.
Fukino teaches that the intervals should be adjusted “by
means of calculation so that all the collector junctions on the
whole surface will exhibit substantially a uniform temperature
rise” [column 3, lines 50-52]. Thus, Fukino is attempting to
achieve the very same result disclosed by appellant which is to
generate a uniform temperature across the transistor. In our
view, once a power transistor having specific materials and
dimensions exists, the calculation to equalize temperature
distribution along the various junctions is straightforward and
generally yields a single solution. Thus, we agree with the
examiner that the intervals in Fukino differ from the claimed
intervals only because they do not involve the exact same
transistor. The calculation of the intervals could probably
produce just about any result depending on the configuration and
dimensions of the Alderstein transistor which is to be modified
according to the teachings of Fukino.
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