US4320403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of metallized sheet-form textile materials as reflection and polarization control media for microwaves
Assignee: Bayer AG
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Filing: 1979-10-30
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Granted: 1982-03-16
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Expires: 1999-10-30
Abstract
Abstract Metallized sheet-form textile materials of synthetic polymers or natural fibres, to which a metal layer has been applied by currentless wet-chemical deposition, are particularly suitable for use as reflectors for electromagnetic waves in the range from 10 MHz to 1000 GHz. In the case of stretched metallized fabrics, the reflecting radiation is partly polarized which can facilitate or improve the recognition of an object by radar beams. By periodically stretching and relaxing the fabric, it is even possible to modulate the reflected microwaves.
Inventors
- 👤 Harold Ebneth
- 👤 Hans-Georg Fitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:09
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/83; D06Q; D06Q1/00; D06Q1/04; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/18; H01Q15/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
In a method of reflecting microwave and high frequency radiation in the range of from 0.01 to 1000 GHz, the improvement comprising using as a reflecting material, metallised sheet-form textile material composed of synthetic polymers and/or natural fibers with the metal applied after activation thereof with a total metal layer thickness of from 0.02 to 2.5 μm by currentless wet-chemical deposition and varying the degree of polarisation of the reflected radiation by one of mono-axial or bi-axial stretching of the sheet-form textile material.
Claim 2
Dependent Claim
83 words
In a method of reflecting microwave and high frequency radiation in the range of from 0.01 to 1000 GHz, the improvement comprising using as a reflecting material, metallised sheet-form textile material composed of synthetic polymers and/or natural fibers with the metal applied after activation thereof with a total metal layer thickness of from 0.02 to 2.5 μm by currentless wet-chemical deposition and varying the degree of polarisation of the reflected radiation by one of mono-axial or bi-axial stretching of the sheet-form textile material.
Claim 3
Dependent Claim
29 words
The method according to claim 1, comprising providing the textile material with a mesh width of less than one tenth of the wavelength of the radiation to be reflected.
Claim 4
Dependent Claim
13 words
The method according to claim 1, comprising providing an additional electro-deposited metal layer.
Claim 5
Dependent Claim
16 words
The method according to claim 1, comprising providing a protective layer on the sheet-form textile material.
Claim 6
Dependent Claim
11 words
The method according to claim 1 wherein the stretching is periodic.
Claim 7
Dependent Claim
60 words
A reflector for radar waves comprising metallised sheet-form textile material composed of synthetic polymers and/or natural fibers with the metal applied after activation thereof with a total metal layer thickness of from 0.02 to 2.5 μm by currentless wet-chemical deposition and means for at least mono-axially stretching the textile material to vary the degree of polarization of the reflected waves.
Claim 8
Dependent Claim
60 words
A reflector for radar waves comprising metallised sheet-form textile material composed of synthetic polymers and/or natural fibers with the metal applied after activation thereof with a total metal layer thickness of from 0.02 to 2.5 μm by currentless wet-chemical deposition and means for at least mono-axially stretching the textile material to vary the degree of polarization of the reflected waves.
Claim 9
Dependent Claim
28 words
The reflector according to claim 6, wherein the mesh width of the textile material is less than one tenth of the wavelength of the radiation to be reflected.
Claim 10
Dependent Claim
12 words
The reflector according to claim 6, further comprising an additional electro-deposited layer.
Claim 11
Dependent Claim
16 words
The reflector according to claim 6, further comprising a protective layer on the sheet-form textile material.
Claim 12
Dependent Claim
11 words
The reflector according to claim 6, wherein the stretching is periodic.
References Cited (Backward Citations)
US2447380A
Cited
US2534710A
Cited
US2750321A
Cited
US2814038A
Cited
US2936453A
Cited
US3969731A
Cited
US3967010A
Cited
US4199623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |