Patent US3374437A successfully refreshed from Google Patents.
US3374437A
Expired / Lapsed
US
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Squelch system for radio receivers
Assignee: Heath Co
•
Filing: 1964-08-26
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Granted: 1968-03-19
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Expires: 1984-08-26
Abstract
No abstract record available.
Inventors
- 👤 Carl F Heald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1646; H04B1/1661; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/341
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3011052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |