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US2856519A
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Automatic signal frequency tracker, with search and hold-during-fade provisions
Assignee: General Precision Laboratory Inc
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Filing: 1952-10-11
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Granted: 1958-10-14
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Expires: 1972-10-11
Abstract
No abstract record available.
Inventors
- 👤 John W Gray
- 👤 Earl G Newsom
- 👤 Jr Robert Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:47
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/14; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2399421A
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US2448564A
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US2512665A
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US2486551A
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US2513786A
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US2516308A
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US2537596A
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US2523537A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |