Appeal No. 1997-4442
Application 08/353,040
portions to be of "substantially the same composition" with
one path portion having a positive TCR and one path portion
having a negative TCR. The paths in Mcquaid are made of
different compositions, NiCrAl and CrSi. Therefore, assuming,
arguendo, that it would have been obvious to replace the
semiconductor materials of de Wit with the materials of
Mcquaid, the Examiner has failed to establish a prima facie
case of obviousness with respect to claims 3 and 5.
Claims 2-6 - Drabkin and Sahagen
Sahagen is applied only to show TiW as a bonding layer.
This limitation occurs only in claim 4, which is not argued.
Thus, we need only address Drabkin.
Drabkin discloses a precision resistor with resistive
material patterns 21 and 22 having opposite curvatures and
slopes of TCR characteristics made of nickel-chrome alloys on
an electrically insulating substrate (col. 11, lines 19-37).
On the side margins 18 of each of these patterns are paths 19
of cut and uncut copper-nickel-gold plated shunts 17 to permit
final R (resistance) trimming and shunts 16 to permit final
TCR trimming (col. 11, lines 42-46).
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