Patent BE744009A successfully refreshed from Google Patents.
US2844720A
Expired / Lapsed
US
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Frequency shift discriminator
Assignee: RADIO FREQUENCY LAB Inc
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Filing: 1954-12-06
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Granted: 1958-07-22
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Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 Everett A Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:56
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H03; H03D; H03D3/00; H03D3/02; H03D3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1480209A
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US1742235A
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US2263645A
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US2531866A
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US2617022A
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US2676286A
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US2750441A
Cited
US2773181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |