Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Reexamination Certificate
2007-10-02
2007-10-02
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
C428S472000, C428S701000
Reexamination Certificate
active
10556374
ABSTRACT:
A dielectric ceramic composition having a relative dielectric constant εrof 15-25 allowing formation of a laminated ceramic part having an appropriate size, capable of being sintered at a temperature lower than 800-1000° C. allowing incorporation and lamination of low resistance conductor of Cu or Ag through simultaneous sintering, and having a low dielectric loss tan δ (high Q-value) and a temperature coefficient τfof resonant frequency has an absolute value not larger than 50 ppm/° C. The dielectric ceramic composition contains 3-30 parts by weight of lead-free low melting point glass containing 50 to 75 wt % of ZnO, 5 to 30 wt % of B2O3, 6 to 15 wt % of SiO2, 0.5 to 5 wt % of Al2O3, and 3 to 10 wt % of BaO, based on 100 parts by weight of major component expressed by a general formula of x′Zn2TiO4-(1−x′−y′)ZnTiO3-y′TiO2where 0.15<x′<0.8 and 0≦y′≦0.2
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Fukuda Koichi
Kawano Takafumi
Frommer & Lawrence & Haug LLP
Group Karl
Santucci Ronald R.
UBE Industries Ltd.
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