US2453988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control
Assignee: Radio Patents Corp
•
Filing: 1944-02-26
•
Granted: 1948-11-16
•
Expires: 1964-02-26
Abstract
No abstract record available.
Inventors
- 👤 Guanella Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:06
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2111598A
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US2173902A
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US2216829A
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US2266065A
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US2227815A
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US2250284A
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US2287925A
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US2266052A
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US2288025A
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US2354510A
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US2358454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |