US4162209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing chaff
Assignee: Thales Underwater Systems Ltd
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Filing: 1978-01-13
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Granted: 1979-07-24
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Expires: 1998-01-13
Abstract
Abstract A method of producing chaff, which method comprises sputtering a coating of a metal on to a plurality of carrier filaments and cutting the coated filaments into small pieces, the metal and the filaments being so chosen that the modulus of elasticity of the metal is not greater than the modulus of elasticity of the filaments.
Inventors
- 👤 Denis V. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:36
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/83; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
A method of producing chaff for deflecting electromagnetic radiation, which method comprises the steps of winding a plurality of glass carrier filaments into groups, sputtering a coating of aluminum on to said plurality of carrier filaments in the presence of an electrostatic field of sufficient magnitude to confine said aluminum to the vicinity of said filaments, and cutting the coated filaments into small pieces.
Claim 2
Independent Claim
64 words
A method of producing chaff for deflecting electromagnetic radiation, which method comprises the steps of winding a plurality of glass carrier filaments into groups, sputtering a coating of aluminum on to said plurality of carrier filaments in the presence of an electrostatic field of sufficient magnitude to confine said aluminum to the vicinity of said filaments, and cutting the coated filaments into small pieces.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 in which the winding step comprises winding the filaments together in groups of three prior to the sputtering.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 in which the sputtering is effected in the presence of a partial vacuum.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1 in which the cutting step comprises milling the coated filaments into small pieces.
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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |