Patent US3281850A successfully refreshed from Google Patents.
US3281850A
Expired / Lapsed
US
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Double-feed antennas operating with waves of two frequencies of the same polarization
Assignee: Hazeltine Research Inc
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Filing: 1962-03-07
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Granted: 1966-10-25
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Expires: 1982-03-07
Abstract
No abstract record available.
Inventors
- 👤 Peter W Hannan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:52
CPC Classifications
H; H01; H01Q; H01Q5/00; H01Q5/40; H01Q5/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A DOUBLE-FEED ANTENNA OPERATING WITH TWO FREE-SPACE POLARIZED WAVES OF THE SAME POLARIZATION BUT OF DIFFERENT FREQUENCIES COMPRISING: A MAIN REFLECTOR; FIRST MEANS FOR FIRST POLARIZED WAVES OF A FIRST FREQUENCY; SECOND FEED MEANS FOR SECOND POLARIZED WAVES OF A SECOND FREQUENCY; AND FREQUENCY-SELECTED MEANS COOPERATING WITH SAID MAIN REFLECTOR AND SAID FEEDS FOR CHANGING THE POLARIZATION OF WAVES OF SAID SECOND FREQUENCY.
Claim 2
Dependent Claim
63 words
A DOUBLE-FEED ANTENNA OPERATING WITH TWO FREE-SPACE POLARIZED WAVES OF THE SAME POLARIZATION BUT OF DIFFERENT FREQUENCIES COMPRISING: A MAIN REFLECTOR; FIRST MEANS FOR FIRST POLARIZED WAVES OF A FIRST FREQUENCY; SECOND FEED MEANS FOR SECOND POLARIZED WAVES OF A SECOND FREQUENCY; AND FREQUENCY-SELECTED MEANS COOPERATING WITH SAID MAIN REFLECTOR AND SAID FEEDS FOR CHANGING THE POLARIZATION OF WAVES OF SAID SECOND FREQUENCY.
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |