US3231893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassegrainian antenna with aperture blocking compensation
Assignee: AT&T Inc
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Filing: 1961-10-05
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Granted: 1966-01-25
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Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 David C Hogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:25
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/02; H01Q19/021; H01Q19/027; H01Q19/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN AN ANTENNA SYSTEM, A FIRST CONCAVE PARABOLOIDAL REFLECTOR HAVING AN OPENING IN ITS VERTEX, A SECOND PARABOLOIDAL REFLECTOR HAVING A CONVEX REFLECTING SURFACE FACING TOWARD SAID FIRST REFLECTOR AND A CONCAVE REFLECTING SURFACE FACING AWAY FROM SAID FIRST REFLECTOR SITUATED CONFOCAL WITH SAID FIRST REFLECTOR, A PARABOLOIDAL HORN-REFLECTOR HAVING AN APERTURE COEXTENSIVE WITH SAID OPENING, THE NEARZONE FIELD OF SAID HORN-REFLECTOR IRRADIATING SAID CONVEX SURFACE THROUGH SAID HOLE FROM BEHIND SAID FIRST REFLECTOR A WAVEGUIDE HORN HAVING AN APERTURE LYING FLUSH WITH SAID CONVEX SURFACE OF SAID SECOND REFLECTOR TO COLLECT ELECTROMAGNETIC WAVES WHICH WOULD OTHERWISE NOT BE TRANSMITTED TO THE FAR FIELD OF SAID ANTENNA, AND MEANS FOR ILLUMINIATING SAID CONCAVE REFLECTING SURFACE WITH THE ELECTROMAGNETIC WAVES COLLECTED BY SAID WAVEGUIDE HORN.
Claim 2
Dependent Claim
124 words
IN AN ANTENNA SYSTEM, A FIRST CONCAVE PARABOLOIDAL REFLECTOR HAVING AN OPENING IN ITS VERTEX, A SECOND PARABOLOIDAL REFLECTOR HAVING A CONVEX REFLECTING SURFACE FACING TOWARD SAID FIRST REFLECTOR AND A CONCAVE REFLECTING SURFACE FACING AWAY FROM SAID FIRST REFLECTOR SITUATED CONFOCAL WITH SAID FIRST REFLECTOR, A PARABOLOIDAL HORN-REFLECTOR HAVING AN APERTURE COEXTENSIVE WITH SAID OPENING, THE NEARZONE FIELD OF SAID HORN-REFLECTOR IRRADIATING SAID CONVEX SURFACE THROUGH SAID HOLE FROM BEHIND SAID FIRST REFLECTOR A WAVEGUIDE HORN HAVING AN APERTURE LYING FLUSH WITH SAID CONVEX SURFACE OF SAID SECOND REFLECTOR TO COLLECT ELECTROMAGNETIC WAVES WHICH WOULD OTHERWISE NOT BE TRANSMITTED TO THE FAR FIELD OF SAID ANTENNA, AND MEANS FOR ILLUMINIATING SAID CONCAVE REFLECTING SURFACE WITH THE ELECTROMAGNETIC WAVES COLLECTED BY SAID WAVEGUIDE HORN.
References Cited (Backward Citations)
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Cited
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US2477694A
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US3071770A
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US2824305A
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US2972743A
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US3133284A
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |