Patent US2452575A successfully refreshed from Google Patents.
US2452575A
Expired / Lapsed
US
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Automatic frequency control
Assignee: Unisys Corp
•
Filing: 1943-04-22
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Granted: 1948-11-02
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Expires: 1963-04-22
Abstract
No abstract record available.
Inventors
- 👤 Charles R Kenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:15
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20474; Y10T74/20492; Y10T74/20504
Claims Analysis
Total Claims: 0
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US2227467A
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US2326737A
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US2287925A
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US2311658A
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US2380947A
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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) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |