Patent US3559731A successfully refreshed from Google Patents.
Patent US3092790A successfully refreshed from Google Patents.
US3092790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional filters
Assignee: Raytheon Co
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Filing: 1960-05-12
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Granted: 1963-06-04
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Expires: 1980-05-12
Abstract
No abstract record available.
Inventors
- 👤 Bernard W Leake
- 👤 Donald A Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2138; H01P1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A DIRECTIONAL FILTER COMPRISING FIRST WAVE CONDUCTING MEANS, SECOND WAVE CONDUCTING MEANS CUT OFF AT A DIFFERENT FREQUENCY THAN SAID FIRST FOR CONDUCTING WAVES OVER AT LEAST ONE CLOSED PATH OF GIVEN COUPLING COEFFICIENT, AND A FOUR-ARM DIRECTIONAL COUPLER HAVING FIRST AND SECOND PAIRS OF ARMS COUPLED TO SAID FIRST AND SECOND CONDUCTING MEANS RESPECTIVELY, THE COEFFICIENT OF COUPLING BETWEEN ARMS OF EACH PAIR BEING SUBSTANTIALLY EQUAL TO SAID GIVEN COUPLING COEFFICIENT WHEREBY SELECTED FREQUENCIES CONDUCTED IN SAID FIRST CONDUCTING MEANS CANCELLED.
Claim 2
Dependent Claim
82 words
A DIRECTIONAL FILTER COMPRISING FIRST WAVE CONDUCTING MEANS, SECOND WAVE CONDUCTING MEANS CUT OFF AT A DIFFERENT FREQUENCY THAN SAID FIRST FOR CONDUCTING WAVES OVER AT LEAST ONE CLOSED PATH OF GIVEN COUPLING COEFFICIENT, AND A FOUR-ARM DIRECTIONAL COUPLER HAVING FIRST AND SECOND PAIRS OF ARMS COUPLED TO SAID FIRST AND SECOND CONDUCTING MEANS RESPECTIVELY, THE COEFFICIENT OF COUPLING BETWEEN ARMS OF EACH PAIR BEING SUBSTANTIALLY EQUAL TO SAID GIVEN COUPLING COEFFICIENT WHEREBY SELECTED FREQUENCIES CONDUCTED IN SAID FIRST CONDUCTING MEANS CANCELLED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |