Patent US5075729A successfully refreshed from Google Patents.
Patent US3553545A successfully refreshed from Google Patents.
US3553545A
Expired / Lapsed
US
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Capacitor with hafnium dioxide dielectric
Assignee: AT&T Inc
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Filing: 1969-09-29
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Granted: 1971-01-05
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Expires: 1989-09-29
Abstract
Abstract HAFNIUM FILM CAPACITORS ARE PREPARED BY REACTIVELY SPUTTERING HAFNIUM DIOXIDE UPON AN ALUMINUM ELECTRODE, SUBJECTING THE RESULTANT ASSEMBLY TO ELECTROLYTIC ANODIZATION AND DEPOSITING A COUNTERELECTRODE THEREON.
Inventors
- 👤 Dieter Gerstenberg
- 👤 Frank T J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:22
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; H01G4/183; H01G4/005; H01G4/008; H01G4/0085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |