US2668871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatic frequency control, more particularly for the reception of carrier shift signals
Assignee: International Standard Electric Corp
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Filing: 1951-05-25
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Granted: 1954-02-09
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Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
- 👤 Violet Andre
- 👤 Cornilleau Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |