Patent US2997580A successfully refreshed from Google Patents.
US2997580A
Expired / Lapsed
US
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Squelch system
Assignee: General Electric Canada Co
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Filing: 1956-03-13
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Granted: 1961-08-22
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Expires: 1976-03-13
Abstract
No abstract record available.
Inventors
- 👤 Lohrer George Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:30
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)
US2404338A
Cited
US2400948A
Cited
US2527617A
Cited
US2652488A
Cited
US2756328A
Cited
US2751493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |