US4233605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter radar decoy
Assignee: Northrop Grumman Systems Corp
•
Filing: 1979-02-15
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Granted: 1980-11-11
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Expires: 1999-02-15
Abstract
Abstract A Doppler radar signature simulator decoy for protecting a helicopter under attack by hostile weapons which home in on a Doppler radar return signal from the helicopters rotors. The decoy returns a strong radar signal which duplicates a relatively weaker signal emitted from the helicopter rotors, leading hostile weapons to the decoy.
Inventors
- 👤 John R. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:09
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/36; F; F41; F41H; F41H11/00; F41H11/02; F41J; F41J2/00; G01S7/40; G01S7/4052; H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q15/00; H01Q15/14; G01S7/4082; G01S7/4095
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A Doppler radar decoy comprising: (a) a body portion including a disk and keel member depending therefrom; (b) rotor shaft means mounted on said body portions; and (c) rotor means including an internal retro-directive spar mounted to rotate on said shaft means.
Claim 2
Dependent Claim
42 words
A Doppler radar decoy comprising: (a) a body portion including a disk and keel member depending therefrom; (b) rotor shaft means mounted on said body portions; and (c) rotor means including an internal retro-directive spar mounted to rotate on said shaft means.
Claim 3
Dependent Claim
20 words
The Doppler radar decoy in accordance with claim 1 wherein said keel member includes ballast in the lower portion thereof.
Claim 4
Dependent Claim
38 words
A Doppler radar decoy comprising (a) a body portion having a hollow cylindrical shape; (b) rotor shaft means mounted on said body portion; and (c) rotor means including an internal retro-directive spar to rotate on said shaft means.
Claim 5
Dependent Claim
38 words
A Doppler radar decoy comprising (a) a body portion having a hollow cylindrical shape; (b) rotor shaft means mounted on said body portion; and (c) rotor means including an internal retro-directive spar to rotate on said shaft means.
Claim 6
Dependent Claim
32 words
The Doppler radar decoy in accordance with claim 3 wherein said body portion includes two or more internally elongated stabilizing vanes running from one end of said body portion to the other.
Claim 7
Dependent Claim
26 words
The Doppler radar decoy in accordance with claim 3 wherein said body portion has a radar reflective tail rotor mounted adjacent to the trailing end thereof.
Claim 8
Dependent Claim
22 words
The Doppler radar decoy in accordance with claim 3 wherein said body portion is provided with a tow line assembly attached thereto.
References Cited (Backward Citations)
US2462102A
Cited
US2746035A
Cited
US3010103A
Cited
US3016532A
Cited
US3114911A
Cited
US3295132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |