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US2617037A
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Automatic frequency control circuit
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-02-17
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Granted: 1952-11-04
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Expires: 1969-02-17
Abstract
No abstract record available.
Inventors
- 👤 Hugenholtz Eduard Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:35
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/20; B; B29; B29C; B29C41/00; B29C41/02; B29C41/14; H03L7/08; H03L7/10; H03L7/107; H03L7/1075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2406309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |