Patent US3560887A successfully refreshed from Google Patents.
US3560887A
Expired / Lapsed
US
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Directional filter comprising a resonant loop coupled to a transmission line pair
Assignee: RCA Corp
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Filing: 1969-08-21
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Granted: 1971-02-02
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Expires: 1989-08-21
Abstract
Abstract A DIRECTIONAL FILTER INCLUDES A RESONANT LOOP BETWEEN A PAIR OF NARROW MICROSTRIP TRANSMISSION LINES. AN OPEN CIRCUIT STUB AT THE END OF ONE OF THE LINES EXTENDS A PARTICULAR DISTANCE BEYOND THE IMMEDIATE COUPLING REGION BETWEEN THAT LINE AND THE RESONANT LOOP.
Inventors
- 👤 Louis Sebastion Napoli
- 👤 John Joseph Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |