Patent US3525812A successfully refreshed from Google Patents.
US3525812A
Expired / Lapsed
US
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Transducer circuit and method of operation
Assignee: JAMES E VERDIER
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Filing: 1969-05-08
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Granted: 1970-08-25
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Expires: 1989-05-08
Abstract
No abstract record available.
Inventors
- 👤 James E Verdier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:44
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H04; H04R; H04R3/00; H04R3/002
Claims Analysis
Total Claims: 0
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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) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |