Patent US2606974A successfully refreshed from Google Patents.
US2606974A
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US
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Directional coupler
Assignee: Hazeltine Research Inc
•
Filing: 1946-05-16
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Granted: 1952-08-12
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Expires: 1966-05-16
Abstract
No abstract record available.
Inventors
- 👤 Harold A Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:38
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/183; H01P5/04; H01P7/00; H01P7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2239905A
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US2423390A
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US2423416A
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US2423526A
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US2562281A
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US2519734A
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US2478317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |