US3074804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intergranular barrier layer dielectric ceramic compositions and the method of production thereof
Assignee: National Research Development Corp UK
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Filing: 1958-11-28
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Granted: 1963-01-22
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Planer George Victor
- 👤 Glaister Raymond Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; H; H01; H01B; H01B3/00; H01B3/02; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1272; H01G4/1281
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
AN INTERGRANULAR BARRIER LAYER CERAMIC DIELECTRIC MATERIAL COMPRISING CONDUCTIVE GRANULES OF A COMPOSITION HAVING A PERVOSKITE TYPE STRUCTURE WHICH IS NON-FERROELECTRIC AT NORMAL CAPACITOR WORKING TEMPERATURES, OF A MIXTURE OF AT LEAST TWO SUBSTANCES SELECTED FROM THE GROUP CONSISTING OF (A) ALKALINE EARTH TITANATES, (B) ALKALINE EARTH ZIROCONATES, (C) ALKLAINE EARTH STANNATES, (D) TANTALUM OXIDE AND (E) A MIXTURE OF BISMUTH OXIDE AND TITANIUM DIOXIDE, AT LEAST ONE OF SAID SUBSTANCES BEING AN ALKALINE EARTH TITANATE, SUBSTANTIALLY EACH OF SAID GRANULES BEING SURROUNDED BY A NON-CONDUCTIVE BARRIER LAYER OF AN OXIDIZED FORM OF SAID COMPOSITION, SAID CERAMIC DIELECTRIC MATERIAL HAVING AN EFFECTIVE DIELECTRIC CONSTANT ABOVE 50,000 AND TAN D AT MOST 0.06.
Claim 2
Dependent Claim
112 words
AN INTERGRANULAR BARRIER LAYER CERAMIC DIELECTRIC MATERIAL COMPRISING CONDUCTIVE GRANULES OF A COMPOSITION HAVING A PERVOSKITE TYPE STRUCTURE WHICH IS NON-FERROELECTRIC AT NORMAL CAPACITOR WORKING TEMPERATURES, OF A MIXTURE OF AT LEAST TWO SUBSTANCES SELECTED FROM THE GROUP CONSISTING OF (A) ALKALINE EARTH TITANATES, (B) ALKALINE EARTH ZIROCONATES, (C) ALKLAINE EARTH STANNATES, (D) TANTALUM OXIDE AND (E) A MIXTURE OF BISMUTH OXIDE AND TITANIUM DIOXIDE, AT LEAST ONE OF SAID SUBSTANCES BEING AN ALKALINE EARTH TITANATE, SUBSTANTIALLY EACH OF SAID GRANULES BEING SURROUNDED BY A NON-CONDUCTIVE BARRIER LAYER OF AN OXIDIZED FORM OF SAID COMPOSITION, SAID CERAMIC DIELECTRIC MATERIAL HAVING AN EFFECTIVE DIELECTRIC CONSTANT ABOVE 50,000 AND TAN D AT MOST 0.06.
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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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |