Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Reexamination Certificate
2009-12-22
2011-10-18
Ha, Nguyen T (Department: 2835)
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
C361S321200, C361S306100, C361S306300, C361S311000, C361S313000
Reexamination Certificate
active
08040658
ABSTRACT:
A SrTiO3-based grain boundary insulation type semiconductor ceramic contains a donor element in solid solution in crystal grains, an acceptor element at least in crystal grain boundaries, an integral width of (222) face of the crystal face of 0.500° or less, and an average powder grain size of crystal grains of 1.0 μm or less. A semiconductor ceramic is obtained by firing this ceramic, and a monolithic semiconductor ceramic capacitor is obtained by using the semiconductor ceramic. The SrTiO3-based grain boundary insulation type semiconductor ceramic powder has a large apparent relative dielectric constant ∈rAPPof 5,000 or more even when the average ceramic grain size of crystal grains is 1.0 μm or less and which has an excellent insulating property. The monolithic semiconductor ceramic capacitor is capable of having a large capacity through reduction in thickness and multilayering.
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Dickstein & Shapiro LLP
Ha Nguyen T
Murata Manufacturing Co. Ltd.
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