US3400343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable bandpass filter
Assignee: Physical Electronics Laboratory
•
Filing: 1965-02-23
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Granted: 1968-09-03
•
Expires: 1985-02-23
Abstract
No abstract record available.
Inventors
- 👤 Philip S Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:40
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A BANDPASS FILTER COMPRISING, THE COMBINATION, AN INPUT PORTION ADAPTED TO RECEIVE RADIO-FREQUENCY ENERGY AND ARRANGED SO THAT ELECTROMAGNETIC FIELDS ARE ESTABLISHED THEREIN, AN OUTPUT PORTION ARRANGED TO SUPPORT RADIO-FREQUENCY FIELDS AND ADAPTED TO DELIVER RADIO-FREQUENCY ENERGY THEREFROM, AND COUPLING MEANS FOR COUPLING ENERGY FROM SAID INPUT PORTION TO SAID OUTPUT PORTION, SAID COUPLING MEANS COMPRISING FIRST AND SECOND FERRITE RESONATOR MEANS EXPOSED TO SAID RADIO-FREQUENCY FIELDS IN A REGION OF HIGH MAGNETIC FIELD STRENGTH IN SAID INPUT AND OUTPUT PORTIONS, RESPECTIVELY, SERIAL COUPLING SECTIONS FOR COUPLING ELECTROMAGNETIC ENERGY AWAY FROM SAID FIRST RESONATOR MEANS AND TO SAID SECOND FERRITE RESONATOR MEANS, AND AN IMPEDANCE INVERTER CONNECTED BETWEEN SAID COUPLING SECTIONS TO INDIRECTLY COUPLE SAID RESONATOR MEANS WHEREBY NO DIRECT COUPLING EXISTS THEREBETWEEN.
Claim 2
Dependent Claim
123 words
A BANDPASS FILTER COMPRISING, THE COMBINATION, AN INPUT PORTION ADAPTED TO RECEIVE RADIO-FREQUENCY ENERGY AND ARRANGED SO THAT ELECTROMAGNETIC FIELDS ARE ESTABLISHED THEREIN, AN OUTPUT PORTION ARRANGED TO SUPPORT RADIO-FREQUENCY FIELDS AND ADAPTED TO DELIVER RADIO-FREQUENCY ENERGY THEREFROM, AND COUPLING MEANS FOR COUPLING ENERGY FROM SAID INPUT PORTION TO SAID OUTPUT PORTION, SAID COUPLING MEANS COMPRISING FIRST AND SECOND FERRITE RESONATOR MEANS EXPOSED TO SAID RADIO-FREQUENCY FIELDS IN A REGION OF HIGH MAGNETIC FIELD STRENGTH IN SAID INPUT AND OUTPUT PORTIONS, RESPECTIVELY, SERIAL COUPLING SECTIONS FOR COUPLING ELECTROMAGNETIC ENERGY AWAY FROM SAID FIRST RESONATOR MEANS AND TO SAID SECOND FERRITE RESONATOR MEANS, AND AN IMPEDANCE INVERTER CONNECTED BETWEEN SAID COUPLING SECTIONS TO INDIRECTLY COUPLE SAID RESONATOR MEANS WHEREBY NO DIRECT COUPLING EXISTS THEREBETWEEN.
References Cited (Backward Citations)
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US3200353A
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US3290625A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |