US4539433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic shield
Assignee: TDK Corp
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Filing: 1983-09-07
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Granted: 1985-09-03
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Expires: 2003-09-07
Abstract
Abstract An electromagnetic shielding material for absorbing electromagnetic energy has been found. The shielding material is flexible and has a thin conductive core with a composite ferrite material deposited around the core. The composite ferrite material is a mixture of ferrite powder and a binder for binding the powder. The conductive core may be formed in the shape of a flat sheet or an elongated textile shape. The binder may be a high molecular compound like plastic. When the core is in a textile shape, the textile covered with the composite ferrite material is woven into a cloth which is sufficiently flexible to form around any desired shape.
Inventors
- 👤 Ken Ishino
- 👤 Yasuo Hashimoto
- 👤 Yoshikazu Narumiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A cloth electromagnetic shield, said shield comprising: a flexible textile member which is substantially electrically conductive; a ferrite layer deposited around said textile member, said ferrite layer being a mixture of ferrite powder and a binder for binding said ferrite powder so that the volume ratio of said ferrite powder to the mixture is in the range of 0.2 to 0.8, wherein said cloth is woven from said textile member.
Claim 2
Dependent Claim
70 words
A cloth electromagnetic shield, said shield comprising: a flexible textile member which is substantially electrically conductive; a ferrite layer deposited around said textile member, said ferrite layer being a mixture of ferrite powder and a binder for binding said ferrite powder so that the volume ratio of said ferrite powder to the mixture is in the range of 0.2 to 0.8, wherein said cloth is woven from said textile member.
Claim 3
Dependent Claim
20 words
An electromagnetic shield according to claim 1, wherein said textile member is formed of carbon textile dispersed with copper ions.
Claim 4
Dependent Claim
17 words
An electromagnetic shield according to claim 3, wherein said textile member is elongated and circular in construction.
Claim 5
Dependent Claim
28 words
An electromagnetic shield according to claim 1, wherein the thickness of said textile member with said ferrite layer is in the range between 3 mm and 5 mm.
Claim 6
Dependent Claim
28 words
An electromagnetic shield according to claim 2, wherein the thickness of said textile member with said ferrite layer is larger than twice the thickness of said textile member.
Claim 7
Dependent Claim
28 words
An electromagnetic shield according to claim 3, wherein the diameter of said textile member with said ferrite layer is larger than twice the diameter of said textile member.
Claim 8
Dependent Claim
18 words
An electromagnetic shield according to claim 1, wherein said ferrite layer is N i -Z n group ferrite.
Claim 9
Dependent Claim
16 words
An electromagnetic shield according to claim 1, wherein said textile member is formed from carbon textile.
Claim 10
Dependent Claim
23 words
An electromagentic shield according to claim 1, wherein said textile member is formed from the mixed spinning of conductive textile and dielectric textile.
Claim 11
Dependent Claim
20 words
An electromagnetic shield according to claim 1, wherein said textile member is formed of acrylic resin dispersed with copper ions.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |