US4439768A
Expired / Lapsed
US
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Metallized sheet form textile microwave screening material, and the method of use
Assignee: Bayer AG
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Filing: 1981-07-07
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Granted: 1984-03-27
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Expires: 2001-07-07
Abstract
Abstract Metallized sheet-form textiles of synthetic polymers or natural fibres to which a metal layer has been applied by wet-chemical currentless deposition are particularly suitable for screening electromagnetic waves in the range from 10 MHz to 1000 GHz. Since the textile properties are substantially unaffected by the metallization, the sheet-form textiles are particularly suitable for use in the medical and communications fields. A multiple-layer construction with insulating intermediate layers and surface linings may be useful, for example in the screening of relatively low frequencies.
Inventors
- 👤 Harold Ebneth
- 👤 Hans-Georg Fitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:43
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0084
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
In a method for screening microwave and high frequency radiation in the range of from 0.01 to 1000 GHz the improvement comprising using as a screening material, at least two layers of metallised filamentary woven textiles 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 2.0 μm by currentless wet-chemical deposition and having a high surface conductivity and being capable of attenuating waves by 30 to 40 dB and providing insulation between the individual metallised layers.
Claim 2
Dependent Claim
91 words
In a method for screening microwave and high frequency radiation in the range of from 0.01 to 1000 GHz the improvement comprising using as a screening material, at least two layers of metallised filamentary woven textiles 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 2.0 μm by currentless wet-chemical deposition and having a high surface conductivity and being capable of attenuating waves by 30 to 40 dB and providing insulation between the individual metallised layers.
Claim 3
Dependent Claim
24 words
The method according to claim 1, comprising providing a metal layer of nickel, cobalt, copper silver, gold, along, in combination or in alloyed form.
Claim 4
Dependent Claim
35 words
The method according to claim 1 or claim 2, comprising providing the filamentary woven textiles comprising cotton, polyacrylonitrile, polyamide, aramide, polyester, viscose, polyolefins, modacrylic, polyurethane, PVC, individually, in combination or in admixture with one another.
Claim 5
Dependent Claim
27 words
The method according to claim 1, comprising providing the mesh width of the textile material as less than half the wavelength of the radiation to be screened.
Claim 6
Dependent Claim
14 words
The method according to claim 1, comprising providing elastic textile material having isotropic properties.
Claim 7
Dependent Claim
16 words
The method according to claim 1, further comprising providing an additional metal layer applied by electrodeposition.
Claim 8
Dependent Claim
16 words
The method according to claim 1, for protection against radiation in the medical and communications fields.
Claim 9
Dependent Claim
17 words
The method according to claim 1, for screening plastics housings and as sealing profiles for electrical sealing.
Claim 10
Dependent Claim
85 words
Screening material for use as metallised cloth, aprons, medical covers, sealing profiles, screened housings and the like for protection against high frequency radiation comprising: at least two layers of metallised filamentary woven textiles 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 2.0 μm by currentless wet-chemical deposition having a high surface conductivity and being capable of attenuating waves by 30 to 40 dB and insulating between the metallised layers.
Claim 11
Dependent Claim
85 words
Screening material for use as metallised cloth, aprons, medical covers, sealing profiles, screened housings and the like for protection against high frequency radiation comprising: at least two layers of metallised filamentary woven textiles 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 2.0 μm by currentless wet-chemical deposition having a high surface conductivity and being capable of attenuating waves by 30 to 40 dB and insulating between the metallised layers.
Claim 12
Dependent Claim
26 words
Screening material according to claim 9, wherein the metal layer is composed of nickel, cobalt, copper, silver and gold, alone, in combination or in alloyed form.
Claim 13
Dependent Claim
32 words
Screening material according to claim 9 or claim 10, wherein the textiles comprise cottin, polyacrylonitrile, polyamide, aramide, polyester, viscose, polyolefins, modacrylic, polyurethane, PVC, individually, in combination or in admixture with one another.
Claim 14
Dependent Claim
25 words
Screening material according to claim 9, wherein the mesh of the textile material is less than half the wavelength of the radiation to be screened.
Claim 15
Dependent Claim
15 words
Screening material according to claim 9, wherein the textile is elastic material having isotropic properties.
Claim 16
Dependent Claim
15 words
Screening material according to claim 9, further comprising an additional metal layer applied by electro-deposition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |