US3732117A
Expired / Lapsed
US
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Dielectric ceramic composition comprising lead-lanthanum titanate solid solution
Assignee: Panasonic Holdings Corp
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Filing: 1971-03-24
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Granted: 1973-05-08
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Expires: 1991-03-24
Abstract
Abstract Dielectric ceramic having a high dielectric constant and a low dielectric loss over a wide frequency range of 1 kHz to 30 MHz, a small temperature coefficient of dielectric constant, high stability with time, a high breakdown voltage and high mechanical strength is a sintered mixture composed essentially of 65 to 96 percent by weight of BaTiO3, 3 to 20 percent by weight of (Pb1 xLa2x(1 y)Ti1 xy xO3 xy)(where x is a 0.15 to 0.8 mole and y is 0.5 to 0.9 mole), 1 to 15 percent by weight of BaZrO3, and/or, as additives, up to 10 percent by weight of at least one additive selected from the group consisting of Bi2O3, Bi2(TiO3)3, Bi2(SnO5), Bi2(ZrO3) and SiO2.
Inventors
- 👤 T Nitta
- 👤 H Taki
- 👤 K Nagase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1236; H01G4/1245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
37 words
A dielectric ceramic composition according to claim 1, wherein said sintered mixture further includes up to 10 percent by weight of at least one additive selected from the group consisting of Bi2O3, Bi2(TiO3)3, Bi2SnO5, Bi2(ZrO3)3 and SiO2.
Claim 2
Dependent Claim
15 words
A dielectric ceramic composition according to claim 2 wherein said additive consists essentially of Bi2O3.
Claim 3
Dependent Claim
15 words
A dielectric ceramic composition according to claim 2 wherein said additive consists essentially of Bi2(TiO3)3.
Claim 4
Dependent Claim
15 words
A dielectric ceramic composition according to claim 2 wherein said additive consists essentially of Bi2SnO5.
Claim 5
Dependent Claim
15 words
A dielectric ceramic composition according to claim 2 wherein said additive consists essentially of Bi2(ZrO3)3.
Claim 6
Dependent Claim
15 words
A dielectric ceramic composition according to claim 2 wherein said additive consists essentially of SiO2.
References Cited (Backward Citations)
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |