Patent US5400798A successfully refreshed from Google Patents.
US2564005A
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US
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Automatic frequency control system
Assignee: Individual
•
Filing: 1945-06-23
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Granted: 1951-08-14
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Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Halpern Julius
- 👤 Robert V Pound
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1936414A
Cited
US2106825A
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US2167201A
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US2144222A
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US2115521A
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GB492610A
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US2250532A
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US2233263A
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US2241937A
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US2374810A
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US2348986A
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US2294942A
Cited
US2393284A
Cited
US2404568A
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US2425924A
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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) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |