Appeal No. 2000-2060
Application 08/568,209
a person of ordinary skill in the field of the invention would
make the combination.” In re Oetiker, 977 F.2d at 1446, 24
USPQ2d at 1447. We find no such reason or motivation in Tango
for one of ordinary skill in the art to make the combination with
Hess and Hawkins.
Tango deals with an improved protective circuit designed to
protect a MOS integrated transistor from being destroyed by an
irregular input pulse. See Tango, column 2, lines 24-27. Tango
discloses in column 4, lines 17-28 and 40-59 that the transistor
and resistor can be arranged in the same layer in order to
decrease stray capacitance. However, there is no discussion in
Tango about combining its teachings with the driver circuitry
(MOSFET transistors) of a drive head for a thermal ink-jet
printhead, like the Hess device, or the polysilicon resistor of a
thermal ink-jet printing chip taught by Hawkins.
Third, Tango does not discuss forming the transistor and
resistor in the same layer in order to reduce the size of the
semi-conductor chip as the Examiner states on page 5, lines 2
through 4 of the Examiner’s Answer or forming the channel of the
transistor in the same layer of the resistor in order to improve
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