US3754256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jamming electronic wave-form information devices
Assignee: Stackpole Carbon Co
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Filing: 1968-08-09
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Granted: 1973-08-21
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Expires: 1988-08-09
Abstract
Abstract Radar and other electronic devices which rely for information upon reflection of a primary wave-form signal are jammed by interposing in the path of the primary signal chaff of compacted vermiform, or expanded, graphite. The primary signal may be electromagnetic, as in the case of radar, or it may be sonic, as in the case of sonar.
Inventors
- 👤 W Nystrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:17
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/38; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/145; H01Q17/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
Chaff for jamming electronic wave-form information devices consisting essentially of expanded natural flake graphite compacted into foil.
Claim 2
Dependent Claim
12 words
Chaff according to claim 2, the foil being about one mil thick.
Claim 3
Dependent Claim
16 words
Chaff according to claim 2, the foil having a density of about 1 to 1.5 gm/cc.
Claim 4
Dependent Claim
13 words
Chaff according to claim 2, the foil being tapered from edge to edge.
Claim 5
Dependent Claim
25 words
Chaff according to claim 5, the foil varying from a thickness of about 5 mils at one edge to one mil at the opposite edge.
Claim 6
Dependent Claim
19 words
Chaff according to claim 2, the expanded graphite including an additive to alter a surface characteristic of the foil.
Claim 7
Dependent Claim
17 words
Chaff according to claim 2, the foil being provided with a surface coating to increase its reflectivity.
Claim 8
Dependent Claim
32 words
In a method of jamming an electronic wave-form information device the step of interposing into the path of the wave jamming chaff consisting essentially of expanded natural flake graphite compacted into foil.
Claim 9
Dependent Claim
21 words
A method according to claim 9, the foil length being substantially that of the wave-length of the wave to be jammed.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |