Patent US2666848A successfully refreshed from Google Patents.
US2666848A
Expired / Lapsed
US
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Selective audio gate circuit
Assignee: ERCO RADIO LAB Inc
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Filing: 1948-12-02
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Granted: 1954-01-19
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Expires: 1968-12-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2173154A
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US2253832A
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US2350888A
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US2448866A
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US2503957A
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US2473432A
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US2553271A
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US2499613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |