US3254309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave amplifier or oscillator employing negative resistance devices mounted a cross slots in wavepath wall
Assignee: AT&T Inc
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Filing: 1964-12-29
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Granted: 1966-05-31
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Expires: 1984-12-29
Abstract
No abstract record available.
Inventors
- 👤 Stewart E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/10; H03F3/12; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN COMBINATION, A HOLLOW CONDUCTIVELY BOUNDED RECTANGULAR WAVEGUIDING STRUCTURE CAPABLE OF SUPPORTING ELECTROMAGNETIC WAVE ENERGY OVER A GIVEN BAND OF FREQUENCIES, A SECTION OF ONE OF THE BROAD WALLS OF SAID WAVEGUIDING STRUCTURE BEING ADJUSTABLE IN A DIRECTION TRANSVERSE TO THE LONGITUDINAL AXIS OF SAID STRUCTURE, A SLOT IN SAID SECTION ELECTROMAGNETICALLY COUPLED TO SAID WAVEGUIDING STRUCTURE, A NONLINEAR IMPEDANCE ELEMENT HAVING A YOLTAGE-CURRENT CHARACTERISTIC WHICH INCLUDES A REGION OF NEGATIVE DYNAMIC RESISTANCE MOUNTED IN SAID SLOT, A CONDUCTIVE ENCLOSURE MOUNTED ON SAID SECTION EXTERNAL TO SAID WAGEGUIDING STRUCTURE AND FORMING A CAVITY WITH SAID SECTION, SAID ENCLOSURE BEING CONTIGUOUS TO AND ELECTROMAGNETICALLY COUPLED TO SAID SLOT, THE COMBINATION OF SAID SLOT, NONLINEAR IMPEDANCE ELEMENT AND CAVITY BEING RESONANT AT A FREQUENCY WITHIN SAID BAND OF FREQUENCIES, AND MEANS FOR BIASING SAID NONLINEAR IMPEDANCE ELEMENT.
Claim 2
Dependent Claim
135 words
IN COMBINATION, A HOLLOW CONDUCTIVELY BOUNDED RECTANGULAR WAVEGUIDING STRUCTURE CAPABLE OF SUPPORTING ELECTROMAGNETIC WAVE ENERGY OVER A GIVEN BAND OF FREQUENCIES, A SECTION OF ONE OF THE BROAD WALLS OF SAID WAVEGUIDING STRUCTURE BEING ADJUSTABLE IN A DIRECTION TRANSVERSE TO THE LONGITUDINAL AXIS OF SAID STRUCTURE, A SLOT IN SAID SECTION ELECTROMAGNETICALLY COUPLED TO SAID WAVEGUIDING STRUCTURE, A NONLINEAR IMPEDANCE ELEMENT HAVING A YOLTAGE-CURRENT CHARACTERISTIC WHICH INCLUDES A REGION OF NEGATIVE DYNAMIC RESISTANCE MOUNTED IN SAID SLOT, A CONDUCTIVE ENCLOSURE MOUNTED ON SAID SECTION EXTERNAL TO SAID WAGEGUIDING STRUCTURE AND FORMING A CAVITY WITH SAID SECTION, SAID ENCLOSURE BEING CONTIGUOUS TO AND ELECTROMAGNETICALLY COUPLED TO SAID SLOT, THE COMBINATION OF SAID SLOT, NONLINEAR IMPEDANCE ELEMENT AND CAVITY BEING RESONANT AT A FREQUENCY WITHIN SAID BAND OF FREQUENCIES, AND MEANS FOR BIASING SAID NONLINEAR IMPEDANCE ELEMENT.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |