Patent US4572960A successfully refreshed from Google Patents.
US4572960A
Expired / Lapsed
US
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Use of metallized knitted net fabrics for protection against microwave radiation
Assignee: Bayer AG
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Filing: 1982-11-01
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Granted: 1986-02-25
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Expires: 2002-11-01
Abstract
Abstract Metallized, particularly nickel-coated, knitted net fabrics are suitable for protecting the eyes against microwave radiation with very little adverse effect upon the field of vision, particularly when the mesh width of the knitted net fabrics amounts to <0.25 λ, preferably <0.1 λ, λ being the wavelength of the radiation to be screened off at the upper frequency limit.
Inventors
- 👤 Harold Ebneth
- 👤 Hans G. Fitzky
- 👤 Gerhard D. Wolf
- 👤 Henning Giesecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:44
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/10; D04B21/12; A; A41; A41D; A41D31/00; A41D31/04; A41D31/26; A41D31/265; D06; D06M; D06M11/00; D06M11/83
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
In a method of protecting the body, especially the eyes, against microwave radiation of a power density range up to 200 mW/cm 2 in the frequency range from 0.2 to 10 GHz comprising covering those parts of the body to be protected with a metallized textile fabric, wherein the improvement comprises said fabric including a metal layer deposited on individual filaments of the fabric, said fabric having a shielding effectiveness which exceeds 20 db and a light transmission of more than 90 to 95%, said fabric being impregnated with a polyurethane.
Claim 2
Dependent Claim
91 words
In a method of protecting the body, especially the eyes, against microwave radiation of a power density range up to 200 mW/cm 2 in the frequency range from 0.2 to 10 GHz comprising covering those parts of the body to be protected with a metallized textile fabric, wherein the improvement comprises said fabric including a metal layer deposited on individual filaments of the fabric, said fabric having a shielding effectiveness which exceeds 20 db and a light transmission of more than 90 to 95%, said fabric being impregnated with a polyurethane.
Claim 3
Dependent Claim
30 words
The method of claim 1, wherein the fabric has a mesh width of <0.25λ, λ being the wavelength of the radiation to be screened off at the upper frequency limit.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein the fabric has a mesh width of <0.1λ.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein the metal is selected from the group consisting of nickel, gold, cobalt, copper and combinations thereof.
Claim 6
Dependent Claim
10 words
The method of claim 1, wherein the metal is nickel.
Claim 7
Dependent Claim
24 words
The method of claim 1, wherein the thickness of the metal layer deposited on the individual filament amounts to from 0.1 to 1.0 μm.
Claim 8
Dependent Claim
14 words
A method according to claim 1, wherein the fabric is a knitted net fabric.
Claim 9
Dependent Claim
12 words
A method according to claim 1, wherein the polyurethane contains carbon black.
Claim 10
Dependent Claim
21 words
A method according to claim 1, wherein the fabric has a percentage of free openings therein of from 80% to 95%.
Claim 11
Dependent Claim
13 words
A method according to claim 1, wherein the fabric is a tulle fabric.
Claim 12
Dependent Claim
14 words
A method according to claim 1, wherein the fabric is a warp knitted fabric.
Claim 13
Dependent Claim
12 words
A method according to claim 1, wherein the fabric is a polyamide.
Claim 14
Dependent Claim
12 words
A method according to claim 1, wherein the fabric is a polyester.
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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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |