Patent US4461844A successfully refreshed from Google Patents.
US4461844A
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Ceramic composition of high dielectric constant
Assignee: Panasonic Holdings Corp
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Filing: 1983-04-11
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Granted: 1984-07-24
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Expires: 2003-04-11
Abstract
Abstract A ceramic composition of a high dielectric constant is provided, which consists of 100 mol parts of barium metatitanate (BaTiO3), (2/3)(7+/-1) mol parts of cerium dioxide, and 7+/-1 mol parts of titanium dioxide (TiO2), and to which 0.05 to 0.2 mol part of MnO2 is added. The ceramic composition has a ceramic microstructure in which a grain size is as small as 2 to 3 mu m and a pore size is small to be not more than 3 mu m. The ceramic composition has a high dielectric constant of about 10,000, a high breakdown voltage, and little dependency on voltage. The ceramic composition is very suitable as a thin dielectric film for a laminated ceramic chip capacitor.
Inventors
- 👤 Gen Itakura
- 👤 Takayuki Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:49
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A ceramic composition of a high dielectric constant, characterized by a microstructure of average grain size from about 2 to 3 microns and average pore size of not more than about 3 microns, in which 0.05 to 0.2 mol part of manganese dioxide (MnO 2 ) is present in a composition which consists of 100 mol parts of barium metatitanate (BaTiO 3 ), (2/3)(7±1) mol parts of cerium dioxide (CeO 2 ), and 7±1 mol parts of titanium dioxide (TiO 2 ).
Claim 2
Dependent Claim
82 words
A ceramic composition of a high dielectric constant, characterized by a microstructure of average grain size from about 2 to 3 microns and average pore size of not more than about 3 microns, in which 0.05 to 0.2 mol part of manganese dioxide (MnO 2 ) is present in a composition which consists of 100 mol parts of barium metatitanate (BaTiO 3 ), (2/3)(7±1) mol parts of cerium dioxide (CeO 2 ), and 7±1 mol parts of titanium dioxide (TiO 2 ).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |