Patent US1945986A successfully refreshed from Google Patents.
Patent US4435465A successfully refreshed from Google Patents.
US4435465A
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Composite material for shielding against electromagnetic radiation
Assignee: Bayer AG
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Filing: 1981-06-11
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Granted: 1984-03-06
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Expires: 2001-06-11
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
2026-11-05 16:57
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: 22
Claim 1
Independent Claim
36 words
A composite material comprising: metallized sheet-form textiles 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 sheet-form textiles.
Claim 2
Dependent Claim
36 words
A composite material comprising: metallized sheet-form textiles 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 sheet-form textiles.
Claim 3
Dependent Claim
50 words
A composite material as claimed in claim 1, wherein the additives includes conductive carbon black in concentrations of no greater than 15% by weight and wherein the sheet-form textiles are at least partly surrounded by a 0.05 to 20 μm thick, highly conductive metal layer applied by currentless wet-chemical deposition.
Claim 4
Dependent Claim
35 words
A composite material as claimed in claim 1 or claim 2, wherein unmetallized regions are present on the sheet-form textiles and wherein the metallized regions are separated by intervals of from 0.01 to 10 μm.
Claim 5
Dependent Claim
18 words
A composite material as claimed in claim 1 wherein the layer thickness is from 0.05 to 20 mm.
Claim 6
Dependent Claim
27 words
A composite material as claimed in claim 1, wherein the sheet-form textiles have a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 7
Dependent Claim
27 words
A composite material as claimed in claim 1, wherein the polymer matrix has a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 8
Dependent Claim
37 words
A composite material as claimed in claim 1, wherein the additives for increasing the ohmic, dielectric and/or magnetic losses are applied to the sheet-form textiles in a layer having a thickness of from 0.1 to 10 μm.
Claim 9
Dependent Claim
38 words
A composite material as claimed in claim 7, wherein the additive layer consists of organic pigments or of a semi-conducting inorganic material and has a conductivity of from 10 0 to 10 4 ohm -1 cm -1 .
Claim 10
Dependent Claim
13 words
A composite material as claimed in claim 1, wherein the material is overcoated.
Claim 11
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 12
Dependent Claim
41 words
A composite material comprising: metallized sheet-form textiles and 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 sheet-form textiles and particles.
Claim 13
Dependent Claim
41 words
A composite material comprising: metallized sheet-form textiles and 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 sheet-form textiles and particles.
Claim 14
Dependent Claim
53 words
A composite material as claimed in claim 11, wherein the additives includes conductive carbon black in concentrations of no greater than 15% by weight and wherein the sheet form textiles and 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 15
Dependent Claim
37 words
A composite material as claimed in claim 11 or claim 12, wherein unmetallized regions are present on the sheet-form textiles and particles and wherein the metallized regions are separated by intervals of from 0.01 to 10 μm.
Claim 16
Dependent Claim
18 words
A composite material as claimed in claim 11, wherein the layer thickness if from 0.05 to 20 mm.
Claim 17
Dependent Claim
27 words
A composite material as claimed in claim 11, wherein the sheet-form textiles have a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 18
Dependent Claim
27 words
A composite material as claimed in claim 11, wherein the polymer matrix has a conductivity of from 10 -2 to 10 4 ohm -1 cm -1 .
Claim 19
Dependent Claim
40 words
A composite material as claimed in claim 11, wherein the additives for increasing the ohmic, delectric and/or magnetic losses are applied to the the sheet-form textiles and particles in a layer having a thickness of from 0.1 to 10 μm.
Claim 20
Dependent Claim
38 words
A composite material as claimed in claim 17, wherein the additive layer consists of organic pigments or of a semi-conducting inorganic material and has a conductivity of from 10 0 to 10 4 ohm -1 cm -1 .
Claim 21
Dependent Claim
13 words
A composite material as claimed in claim 11, wherein the material is overcoated.
Claim 22
Dependent Claim
19 words
A shielding material for electromagnetic radiation of no less than 0.05 GHz, comprising the composite material of claim 11.
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |