US2557979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation
Assignee: STC PLC
•
Filing: 1948-02-06
•
Granted: 1951-06-26
•
Expires: 1968-02-06
Abstract
No abstract record available.
Inventors
- 👤 Labin Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/28; H03C7/00; H03C7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2085406A
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US2173234A
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US2051537A
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US2190515A
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US2290587A
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US2335659A
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US2425657A
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US2511106A
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US2385086A
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US2424357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |