Patent US2679632A successfully refreshed from Google Patents.
US2679632A
Expired / Lapsed
US
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Directional coupler
Assignee: AT&T Inc
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Filing: 1950-06-28
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Granted: 1954-05-25
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Expires: 1970-06-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Brian C Bellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:25
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB583501A
Cited
US2423416A
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US2412393A
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US2474688A
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US2523254A
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US2486818A
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US2554295A
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US2575571A
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US2494596A
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US2551777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |