Patent US3497835A successfully refreshed from Google Patents.
US3497835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave filter
Assignee: Raytheon Co
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Filing: 1965-12-10
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Granted: 1970-02-24
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 George I Tsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/2039; H01P1/207; H01P1/209
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A FILTER COMPRISING A WAVEGUIDE SECTION HAVING A LONGITUDINAL AXIS AND OF A CROSS-SECTION SELECTED TO INHIBIT A SELECTED FREQUENCY BAND OF ELECTROMAGNETIC ENERGY, AND A PLURALITY OF PAIRS OF WAVEGUIDE SECTION ELEMENTS, EACH PAIR COUPLED TO SAID WAVEGUIDE SECTION ON OPPOSITE SIDE THEREOF, EACH PAIR OF ELEMENTS BEING OFFSET FROM ONE ANOTHER ALONG THE LONGITUDINAL AXIS BY A PREDETERMINED DISTANCE LESS THAN THE WIDTH OF EITHER OF SAID ELEMENTS, ONE ELEMENT OF EACH PAIR HAVING A STEPPED CONFIGURATION AT THE END THEREOF TO PROVIDE A SUBSTANTIALLY ABRUPT FREQUENCY CUT-OFF CHARACTERISTIC, SELECTED ONES OF THE ELEMENTS HAVING LENGTHS TO BE AN EVEN MULTIPLE OF THE QUARTER WAVE LENGTH OF THE CENTER FREQUENCY OF THE PASS BAND AND SELECTED ONES OF THE ELEMENTS HAVING LENGTHS WHICH ARE AN ODD MULTIPLE OF THE CENTER FREQUENCY OF THE DESIRED REJECT BAND.
Claim 2
Dependent Claim
138 words
A FILTER COMPRISING A WAVEGUIDE SECTION HAVING A LONGITUDINAL AXIS AND OF A CROSS-SECTION SELECTED TO INHIBIT A SELECTED FREQUENCY BAND OF ELECTROMAGNETIC ENERGY, AND A PLURALITY OF PAIRS OF WAVEGUIDE SECTION ELEMENTS, EACH PAIR COUPLED TO SAID WAVEGUIDE SECTION ON OPPOSITE SIDE THEREOF, EACH PAIR OF ELEMENTS BEING OFFSET FROM ONE ANOTHER ALONG THE LONGITUDINAL AXIS BY A PREDETERMINED DISTANCE LESS THAN THE WIDTH OF EITHER OF SAID ELEMENTS, ONE ELEMENT OF EACH PAIR HAVING A STEPPED CONFIGURATION AT THE END THEREOF TO PROVIDE A SUBSTANTIALLY ABRUPT FREQUENCY CUT-OFF CHARACTERISTIC, SELECTED ONES OF THE ELEMENTS HAVING LENGTHS TO BE AN EVEN MULTIPLE OF THE QUARTER WAVE LENGTH OF THE CENTER FREQUENCY OF THE PASS BAND AND SELECTED ONES OF THE ELEMENTS HAVING LENGTHS WHICH ARE AN ODD MULTIPLE OF THE CENTER FREQUENCY OF THE DESIRED REJECT BAND.
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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |