Patent US2824980A successfully refreshed from Google Patents.
US2824980A
Expired / Lapsed
US
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Piezoelectric transducers
Assignee: Erie Resistor Corp
•
Filing: 1952-03-14
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Granted: 1958-02-25
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Expires: 1972-03-14
Abstract
No abstract record available.
Inventors
- 👤 Howard I Oshry
- 👤 John W Schell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:38
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/04; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232
Claims Analysis
Total Claims: 0
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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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |