US2669666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transducer
Assignee: AT&T Inc
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Filing: 1952-06-27
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Granted: 1954-02-16
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Expires: 1972-06-27
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
- 👤 Bernd T Matthias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/02; H03H9/02007; H03H9/02015; H03H9/02086; H03H9/02133
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
AN ELECTROMECHANICAL TRANSDUCER COMPRISING A CRYSTALLINE ELEMENT OF AMMONIUM-D4 DEUTERIUM PHOSPHATE, OPPOSING FACES OF WHICH ARE COATED WITH A PAIR OF CONDUCTING ELECTRODES COMPRISING ADHERENT MATERIAL FORMED ON THE SURFACE OF SAID ELEMENT.
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) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |