US3309704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable absorber
Assignee: North American Aviation Corp
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Filing: 1965-09-07
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Granted: 1967-03-14
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Expires: 1985-09-07
Abstract
No abstract record available.
Inventors
- 👤 Eugene H Klingler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
AN ACTIVE ATTENUATOR OF ELECTROMAGNETIC ENERGY COMPRISING: AN ELECTRICALLY CONDUCTIVE GROUND PLANE; AN IMPEDANCE LAYER SPACED APART FROM SAID GROUND PLANE AND SUBSTANTIALLY PARALLEL THERETO, SAID IMPEDANCE LAYER HAVING AN EXTENT MUCH LARGER THAN THE WAVE LENGTH OF ENERGY TO BE ATTENUATED; A DIELECTRIC MATERIAL BETWEEN SAID GROUND PLANE AND SAID IMPEDANCE LAYER; ANTENNA MEANS FOR RECEIVING ELECTROMAGNETIC ENERGY; DISCRIMINATOR MEANS CONNECTED TO SAID FIRST ANTENNA MEANS FOR PROVIDING A SIGNAL REPRESENTATIVE OF FREQUENCY OF THE ELECTROMAGNETIC ENERGY; MEANS RESPONSIVE TO THE SIGNAL FROM SAID DISCRIMINATOR MEANS FOR PROVIDING AN OUTPUT VOLTAGE THAT VARIES WITH SAID SIGNAL ACCORDING TO A PREDETERMINED RELATION; AND MEANS FOR EMPLOYING THE OUTPUT VOLTAGE FOR CHANGING INTENSIVE PROPERTIES OF SAID DIELECTRIC MATERIAL.
Claim 2
Dependent Claim
117 words
AN ACTIVE ATTENUATOR OF ELECTROMAGNETIC ENERGY COMPRISING: AN ELECTRICALLY CONDUCTIVE GROUND PLANE; AN IMPEDANCE LAYER SPACED APART FROM SAID GROUND PLANE AND SUBSTANTIALLY PARALLEL THERETO, SAID IMPEDANCE LAYER HAVING AN EXTENT MUCH LARGER THAN THE WAVE LENGTH OF ENERGY TO BE ATTENUATED; A DIELECTRIC MATERIAL BETWEEN SAID GROUND PLANE AND SAID IMPEDANCE LAYER; ANTENNA MEANS FOR RECEIVING ELECTROMAGNETIC ENERGY; DISCRIMINATOR MEANS CONNECTED TO SAID FIRST ANTENNA MEANS FOR PROVIDING A SIGNAL REPRESENTATIVE OF FREQUENCY OF THE ELECTROMAGNETIC ENERGY; MEANS RESPONSIVE TO THE SIGNAL FROM SAID DISCRIMINATOR MEANS FOR PROVIDING AN OUTPUT VOLTAGE THAT VARIES WITH SAID SIGNAL ACCORDING TO A PREDETERMINED RELATION; AND MEANS FOR EMPLOYING THE OUTPUT VOLTAGE FOR CHANGING INTENSIVE PROPERTIES OF SAID DIELECTRIC MATERIAL.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |