US2542974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable high-frequency circuit
Assignee: STC PLC
•
Filing: 1946-01-26
•
Granted: 1951-02-27
•
Expires: 1966-01-26
Abstract
No abstract record available.
Inventors
- 👤 Abraham E Abbot
- 👤 Harry W Dryden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H01; H01P; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2249443A
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US2226479A
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US2159782A
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US2353742A
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US2395851A
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US2408355A
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US2411424A
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US2358462A
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US2434115A
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US2425352A
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US2446405A
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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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |