Patent US2589711A successfully refreshed from Google Patents.
US2589711A
Expired / Lapsed
US
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Off-channel squelch circuit for radio receivers
Assignee: AT&T Inc
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Filing: 1948-05-05
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Granted: 1952-03-18
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Expires: 1968-05-05
Abstract
No abstract record available.
Inventors
- 👤 Lester Y Lacy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:26
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; H03G3/26; H03G3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2096874A
Cited
US2197516A
Cited
US2261643A
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US2372934A
Cited
US2370216A
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US2447564A
Cited
US2479305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |