US2691738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device embodying ferroelectric lanthanum-containing substances
Assignee: AT&T Inc
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Filing: 1949-04-08
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Granted: 1954-10-12
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Expires: 1969-04-08
Abstract
No abstract record available.
Inventors
- 👤 Bernd T Matthias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; C04B35/50; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
AN ELECTRIC DEVICE COMPRISING TWO CONDUCTING ELECTRODES SPACED BY A FERROELECTRIC BODY COMPRISING A CERAMIC OF SINTERED FINELY DIVIDED CRYSTALLINE PARTICLES OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF LANTHANUM GALLATE AND LANTHANUM ALUMINATE.
Claim 2
Dependent Claim
35 words
AN ELECTRIC DEVICE COMPRISING TWO CONDUCTING ELECTRODES SPACED BY A FERROELECTRIC BODY COMPRISING A CERAMIC OF SINTERED FINELY DIVIDED CRYSTALLINE PARTICLES OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF LANTHANUM GALLATE AND LANTHANUM ALUMINATE.
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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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |