US2598707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device embodying ferroelectric substance
Assignee: AT&T Inc
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Filing: 1949-10-20
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Granted: 1952-06-03
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Expires: 1969-10-20
Abstract
No abstract record available.
Inventors
- 👤 Bernd T Matthias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
A PIEZOELECTRIC DEVICE COMPRISING A PAIR OF CONDUCTING ELECTRODES SPACED BY A FERROELECTRIC BODY COMPRISING A CERAMIC OF SINTERED FINELY DIVIDED CRYSTAL PARTICLES CONSISTING OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM METACOLUMBATE, POTASSIUM METACOLUMBATE, SODIUM METATANTALATE, POTASSIUM METATANTALATE AND LITHIUM METATANTALATE, SAID BODY HAVING A SUBSTANTIAL PERMANENT OVER-ALL ELECTRICAL POLARIZATION.
References Cited (Backward Citations)
US2486560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |