US3710382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary radar
Assignee: AC Cossor Ltd
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Filing: 1971-08-26
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Granted: 1973-01-09
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Expires: 1991-08-26
Abstract
Abstract To increase the data rate of a mechanically scanning radar aerial, two aerials on a common support share a common rotating joint to which they are alternately switched under remote control, preferably in response to burst of RF power transmitted from the aerial.
Inventors
- 👤 A Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/005; G; G01; G01S; G01S1/00; G01S1/02; H01Q3/00; H01Q3/02; H01Q3/04; H01Q3/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A secondary radar aerial system comprising a rotatable support, a plurality of directional aerials mounted on said support to face in different directions, means for rotating said support to cause the aerials to effect scanning, a common rotating joint for said aerials, switching means for selectively coupling said aerials to said joint, and remote control means for operating said switching means.
Claim 2
Dependent Claim
61 words
A secondary radar aerial system comprising a rotatable support, a plurality of directional aerials mounted on said support to face in different directions, means for rotating said support to cause the aerials to effect scanning, a common rotating joint for said aerials, switching means for selectively coupling said aerials to said joint, and remote control means for operating said switching means.
Claim 3
Dependent Claim
18 words
A system according to claim 1, wherein there are two aerials mounted back to back on said support.
Claim 4
Dependent Claim
33 words
A system according to claim 1, wherein said remote control means comprise means for detecting RF power transmitted by said system and means responsive to the detected power to operate said switching means.
Claim 5
Dependent Claim
39 words
A system according to claim 3, wherein said remote control means include means for delaying operation of said switching means for a time sufficient to allow replies to the transmitted power to be received from transponders at maximum range.
Claim 6
Dependent Claim
45 words
A system according to claim 3, wherein the aerials are two in number and said means responsive comprise a bistable flip-flop arranged to change state in response to each detection of transmitted power and arranged to operate the switching means for the two aerials alternately.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |