Appeal No. 1997-2034
Application No. 08/347,788
the respective channels thereof corresponding to said VT-
adjust implant," the definition given on page 7 of the
specification for natural transistors. Thus, all of the
claims include two natural field effect transistors.
The examiner admits (Answer, page 4) that none of the
references (Numata, Yoshida, and Lee) explicitly discloses
natural transistors. Nonetheless, the examiner concludes that
the use of natural transistors in the combination of the three
references would have been obvious because "appellants'
definition of 'natural' transistors is simply that the
transistors have no VT-adjust implanting, i.e., their
thresholds will vary proportionately to changes in
temperature/process variations. Since the FETs of the three
references clearly have such a characteristic (indeed, this is
how the references perform their temperature compensation),"
the use of natural transistors in the combination of the
references would have been obvious.
We find no evidence in any of the references that natural
transistors are employed and no suggestion as to why they
should be utilized. In particular, as Numata uses diodes, not
transistors, we, unlike the examiner, find it difficult to
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