Patent US3028248A successfully refreshed from Google Patents.
US3028248A
Expired / Lapsed
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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: 1962-04-03
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Glaister Raymond Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:11
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1272; H01G4/1281; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; Y; Y10; Y10T; Y10T29/00; Y10T29/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF MANUFACTURING INTERGRANULAR BARRIER LAYER CERAMIC DIELECTRIC MATERIAL INCLUDING THE STEPS OF MAKING POWDERED BARIUM TITANATE OF HIGH PURITY, AND SUBSTANTIALLY FREE FROM IMPURITIES INHIBITING THE TRANSFORMATION OF BARIUM TITANATE FROM ITS TETRAGONAL POYLMORPH TO ITS HEXAGONAL POLYMORPH, INTO A FORM, FIRING THE FORM IN A REDUCING ATMOSPHERE SUBSTANTIALLY FREE FROM OXIDIZING AGENTS AT A TEMPERATURE BETWEEN 1330* C. AND 1550*C. UNTIL SUBSTANTIALLY ALL THE BARIUM TITANATE IS TRANSFORMED INTO A POROUS MASS OF ITS HEXAGONAL POLYMORPH, COOLING THE FORM, COOLING OVER THE TEMPERATURE RANGE OF SUBSTANTIALLY 1330*C. TO 1000*C. TAKING PLACE IN A REDUCING ATMOSPHERE IN SUBSTANTIALLY ONE HOUR AND THEN FIRING THE FORM WHOLLY IN AN OXIDIZING ATMOSPHERE FOR ONE TO FIVE HOURS AT A TEMPERATURE BETWEEN 1000* C. AND 650*C.
Claim 2
Independent Claim
125 words
A METHOD OF MANUFACTURING INTERGRANULAR BARRIER LAYER CERAMIC DIELECTRIC MATERIAL INCLUDING THE STEPS OF MAKING POWDERED BARIUM TITANATE OF HIGH PURITY, AND SUBSTANTIALLY FREE FROM IMPURITIES INHIBITING THE TRANSFORMATION OF BARIUM TITANATE FROM ITS TETRAGONAL POYLMORPH TO ITS HEXAGONAL POLYMORPH, INTO A FORM, FIRING THE FORM IN A REDUCING ATMOSPHERE SUBSTANTIALLY FREE FROM OXIDIZING AGENTS AT A TEMPERATURE BETWEEN 1330* C. AND 1550*C. UNTIL SUBSTANTIALLY ALL THE BARIUM TITANATE IS TRANSFORMED INTO A POROUS MASS OF ITS HEXAGONAL POLYMORPH, COOLING THE FORM, COOLING OVER THE TEMPERATURE RANGE OF SUBSTANTIALLY 1330*C. TO 1000*C. TAKING PLACE IN A REDUCING ATMOSPHERE IN SUBSTANTIALLY ONE HOUR AND THEN FIRING THE FORM WHOLLY IN AN OXIDIZING ATMOSPHERE FOR ONE TO FIVE HOURS AT A TEMPERATURE BETWEEN 1000* C. AND 650*C.
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |