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US2474354A
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Automatic frequency control circuits
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
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Filing: 1943-06-04
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Granted: 1949-06-28
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Expires: 1963-06-04
Abstract
No abstract record available.
Inventors
- 👤 Guanella Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:07
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03C; H03C3/00; H03C3/02; H03C3/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US363862A
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US1819904A
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US1907965A
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US2231996A
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US2261800A
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US2245685A
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US2296100A
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US2287925A
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US2354510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |