Appeal No. 96-0019
Application 08/150,742
equidistantly apart, the temperature distribution across the
active areas is not equal [Id., lines 38-49]. It is the purpose
of Fukino to adjust the interval between adjacent emitter
junction segments so as to create a substantially uniform
junction temperature across the entire transistor.
Although claim 24 does not recite any details regarding
the materials of the transistor, the examiner has cited
Alderstein to demonstrate that a heterojunction power transistor
of the type disclosed by appellant was known in the art. In
other words, it is the position of the examiner that Alderstein
teaches the prior art transistor before appellant’s modification
in which the emitter junctions are located at equal intervals
from each other. The examiner concludes that it would have been
obvious to the artisan to space adjacent emitter junctions at the
claimed interval in order to equalize the temperature
distribution along the entire transistor [answer, page 3].
Appellant argues that Fukino gives a numerical example of
his spacing in which the interval nearest the central region is
only 5% larger than the next-nearest interval to the central
region. Appellant asserts that the difference between a 5%
spacing arrangement and a 50% spacing arrangement is more than a
5
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