Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Reexamination Certificate
2009-09-18
2010-11-09
Lee, Kyung (Department: 2833)
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
C338S307000
Reexamination Certificate
active
07830240
ABSTRACT:
A multilayer positive temperature coefficient thermistor includes a ceramic body having semiconductor ceramic layers and internal electrodes, the semiconductor ceramic layers being mainly composed of BaTiO3and containing semiconductor-forming agents, the semiconductor ceramic layers and the internal electrodes being alternately stacked, and the outermost layers of the ceramic body being formed of the semiconductor ceramic layers. The outermost layers serve as protective layers. The semiconductor ceramic layers arranged between the internal electrodes4aand4dserve as effective layers. The protective layers contain a semiconductor-forming agent having a larger ionic radius than that of a semiconductor-forming agent contained in the effective layers. The protective layers have a lower porosity than that of the effective layers.
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Kishimoto Atsushi
Mihara Kenjirou
Dickstein , Shapiro, LLP.
Lee Kyung
Murata Manufacturing Co. Ltd.
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