US4471015A
Expired / Lapsed
US
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Composite material for shielding against electromagnetic radiation
Assignee: Bayer AG
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Filing: 1983-07-14
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Granted: 1984-09-11
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Expires: 2003-07-14
Abstract
Abstract A composite material comprising a polymer matrix containing metallized sheet-form textiles and/or metallized particles, and in addition additives for increasing the ohmic, electrical and/or magnetic losses which are uniformly present in the polymer and/or on the sheet-form textiles and/or particles, has a high shielding effect against electromagnetic radiation both in the short-range field and also in the long-range field over a wide frequency range.
Inventors
- 👤 Harold Ebneth
- 👤 Hans G. Fitzky
- 👤 Wolfgang Oberkirch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:07
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0088; B; B29; B29C; B29C70/00; B29C70/88; B29C70/882; B29C70/885; D; D04; D04H; D04H1/00; D04H1/40; D04H1/407; D04H1/42; H01; H01Q; H01Q17/00; H01Q17/005; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2995/00; B29K2995/0003; B29K2995/0005; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/2481; Y10T428/24818; Y10T428/24893; Y10T428/24909; Y10T428/25; Y10T428/26; Y10T428/261; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2958; Y10T428/2973; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/30; Y10T428/31504; Y10T428/31678; Y10T442/00; Y10T442/20; Y10T442/259; Y10T442/2607; Y10T442/60; Y10T442/654; Y10T442/655
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the additives includes pigments or conductive carbon black in concentrations of no greater than 10% by weight and wherein the particles are at least partly surrounded by a 0.05 to 20 μm thick, highly conductive metal layer applied by currentless wet-chemical deposition.
Claim 2
Dependent Claim
77 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the additives includes pigments or conductive carbon black in concentrations of no greater than 10% by weight and wherein the particles are at least partly surrounded by a 0.05 to 20 μm thick, highly conductive metal layer applied by currentless wet-chemical deposition.
Claim 3
Dependent Claim
31 words
A composite material as claimed in claim 1, wherein unmetallized regions are present on the particles and wherein the metallized regions are separated by intervals of from 0.01 to 10 μm.
Claim 4
Dependent Claim
18 words
A composite material as claimed in claim 1, wherein the layer thickness is from 0.05 to 20 mm.
Claim 5
Dependent Claim
14 words
A composite material as claimed in claim 1, wherein the particles are rodlet like.
Claim 6
Dependent Claim
53 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the polymer matrix has a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 7
Dependent Claim
53 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the polymer matrix has a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 8
Dependent Claim
62 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the additives for increasing the ohmic, dielectric and/or magnetic losses are applied to the particles in a layer having a thickness of from 0.01 to 10 μm.
Claim 9
Dependent Claim
62 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein the additives for increasing the ohmic, dielectric and/or magnetic losses are applied to the particles in a layer having a thickness of from 0.01 to 10 μm.
Claim 10
Dependent Claim
37 words
A composite material as claimed in claim 6, wherein the additive layer consists of organic pigments or of a semi-conducting inorganic material and has a conductivity of from 10° to 10 4 ohm -1 cm -1 .
Claim 11
Dependent Claim
13 words
A composite material as claimed in claim 1, wherein the material is overcoated.
Claim 12
Dependent Claim
19 words
A shielding material for electromagnetic radiation of no less than 0.05 GHz, comprising the composite material of claim 1.
Claim 13
Dependent Claim
57 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein unmetallized regions are present on the particles and wherein the metallized regions are separated by intervals of from 0.01 to 10 μm.
Claim 14
Dependent Claim
57 words
A composite material comprising: metallized particles contained in a polymer matrix with additives for increasing at least one of the ohmic, electrical and magnetic losses uniformly present in the polymer or on the particles, wherein unmetallized regions are present on the particles and wherein the metallized regions are separated by intervals of from 0.01 to 10 μm.
References Cited (Backward Citations)
US2923934A
Cited
US2718506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |