Patent US2489273A successfully refreshed from Google Patents.
US2489273A
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US
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Radio-frequency converting circuits
Assignee: STC PLC
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Filing: 1945-10-16
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Granted: 1949-11-29
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Expires: 1965-10-16
Abstract
No abstract record available.
Inventors
- 👤 Sven H M Dodington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:50
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/42; G01S7/4082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2102426A
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US2038285A
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US2234331A
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US2268085A
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US2286804A
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US2408355A
Cited
US2369268A
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US2411424A
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US2398502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |