US4555494A
Expired / Lapsed
US
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Dielectric ceramic compositions
Assignee: Panasonic Holdings Corp
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Filing: 1983-09-16
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Granted: 1985-11-26
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Expires: 2003-09-16
Abstract
Abstract A dielectric ceramic composition consisting essentially of: Pb(M1/3Nb2/3)x(M'aNb1-a)y(Fe2/3W1/3)zO3, wherein M represents Ni or Mg and x+y+z=1, and when M is Ni, M'=Fe, a=1/2, 0.01</=x</=0.40, 0.45</=y</=0.80 and 0.05</=z</=0.50; and when M is Mg, M'=Zn, a=1/3, 0.01</=x</=0.70, 0.15</=y</=0.45 and 0.05</=z</=0.60. The ceramic composition allows low-temperature sintering and exhibits high dielectric constant.
Inventors
- 👤 Masamitsu Nishida
- 👤 Hiromu Ouchi
- 👤 Yoshihiro Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A ceramic composition having a dielectric constant of 6380 or higher, and a sintering temperature of 960° C. or lower and consisting essentially of Pb(Mg.sub.1/3 Nb.sub.2/3).sub.x (Zn.sub.1/3 Nb.sub.2/3).sub.y (Fe.sub.2/3 W.sub.1/3).sub.z O.sub.3 wherein 0.01 ≦x≦0.70, 0.15≦y≦0.45, 0.05≦z≦0.60 and x+y+z=1.
Claim 2
Dependent Claim
38 words
A ceramic composition having a dielectric constant of 6380 or higher, and a sintering temperature of 960° C. or lower and consisting essentially of Pb(Mg.sub.1/3 Nb.sub.2/3).sub.x (Zn.sub.1/3 Nb.sub.2/3).sub.y (Fe.sub.2/3 W.sub.1/3).sub.z O.sub.3 wherein 0.01 ≦x≦0.70, 0.15≦y≦0.45, 0.05≦z≦0.60 and x+y+z=1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |