Appeal No. 1998-0129 Page 24
Application No. 08/438,062
selecting BST over PZT in order to provide stable electrical
characteristics and to prevent fatigue. Appellants assert
(reply brief, pages 6 and 7) that the concepts of stability
and fatigue referred to by Koyama (page 32.1.1, col.1) have
“nothing to do with capacitance stability at high
frequencies.”
From our review of Koyama, we find that Koyama does not
make specific reference to capacitance stability at high
frequencies. However, we find that Koyama, having considered
several high dielectric materials including, inter alia, PZT,
PLZT, and BST, chose BST because of BSTs stable electrical
characteristics, and to prevent fatigue. From these teachings
of Koyama, we find that Koyama would have suggested replacing
the PZT or PLZT layer of Miller with BST. As the teachings of
Miller and Koyama as a whole would have suggested replacing
PZT with BST, we are in agreement with the examiner (answer,
page 10) that the capacitor would have inherently exhibited
stable capacitance at high frequencies.
Accordingly, we are in agreement with the examiner that
stable capacitance at the claimed high frequency ranges would
have expectedly resulted from modification of Miller in view
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