Patent US5116790A successfully refreshed from Google Patents.
US5116790A
Expired / Lapsed
US
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COG dielectric with high K
Assignee: EIDP Inc
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Filing: 1990-11-16
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Granted: 1992-05-26
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Expires: 2010-11-16
Abstract
Abstract A composition consisting essentially of 60.0-70.0 mol % TiO 2 , 14.3-20.0 mol % Nd 2 O 3 , 11.0-16.7 mol % BaO, 1.0-8.0 mol % ZrO 2 and 0.05-0.30 mol % CeO 2 . This composition is useful for forming densified ceramic dielectric bodies having a dielectric constant of at least 65 and which meet COG specifications, and multilayer capacitors that contain such dielectric bodies.
Inventors
- 👤 Salvatore A. Bruno
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A composition of a COG densified dielectric body, composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 .
Claim 2
Dependent Claim
48 words
A composition of a COG densified dielectric body, composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 .
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein (a) through (e) are chemically co-precipitated then calcined to form the composition.
Claim 4
Dependent Claim
44 words
The composition of claim 2 consisting essentially of (a) 64.0-67.0 mol % TiO 2 ; (b) 18.0-19.0 mole % Nd 2 O 3 ; (c) 12.8-13.0 mol % BaO; (d) 1.5-3.0 mol % ZrO 2 ; and (e) 0.15-0.25 mol % CeO 2 .
Claim 5
Dependent Claim
21 words
The composition of claim 1 further comprising an organic medium containing a solution of volatile organic solvent and organic polymeric binder.
Claim 6
Dependent Claim
22 words
A dielectric sheet comprising a cast layer of the composition of claim 4 which has been heated to remove volatile organic medium.
Claim 7
Dependent Claim
28 words
A dielectric ceramic layer comprising the sheet of claim 5 which has been fired to volatilize the organic medium therefrom and to densify the inorganic components by sintering.
Claim 8
Dependent Claim
61 words
A capacitor comprising a plurality of the dielectric ceramic layers of claim 6, and at least two metal electrodes which are separated from each other by at least one said dielectric ceramic layer, the assemblage having been fired at a temperature above 1240° C. to volatilize organic medium, densify the inorganic materials in the dielectric sheets and sinter the metal electrodes.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |