US4890083A
Expired / Lapsed
US
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Shielding material and shielded room
Assignee: EMS ENGINEERED MATERIALS SOLUTIONS LLC
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Filing: 1988-10-20
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Granted: 1989-12-26
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Expires: 2008-10-20
Abstract
Abstract A shield for electromagnetic radiations comprising a laminated sheet having exterior layers of copper which sandwich an interior layer of a ferromagnetic alloy taken from the class consisting of nickel-iron compounds having from about 42 to about 80 percent nickel by weight and iron as a substantial portion of the remaining material. The layers are metallurgically bonded to each other by sintering or the like. According to a second embodiment, a laminated sheet is provided having exterior layers of copper which sandwich plural interior layers of ferromagnetic material, the layers of ferromagnetic material having progressively higher permeability and being capable of shielding interference of progressively lower energy level when travelling in a direction away from the direction of the source of interference. A typical laminated sheet in the direction away from the source of interference is copper/permendur/80/copper. A further typical such laminated sheet in the direction away from the source of interference is copper/49/80/copper. In those instances where it is known that no high frequencies will be encountered, the copper layers can be removed. It is necessary that each successive layer in the direction away from the source of interfering electromagnetic radiations be at maximum permeability range at a lower interference energy level.
Inventors
- 👤 George Trenkler
- 👤 Richard G. Delagi
- 👤 Francois A. Padovani
- 👤 Donald L. Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:46
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0088; H01; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1008
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
101 words
A shield material for electromagnetic radiations comprising: (a) a first layer of ferromagnetic material having opposing major surfaces and having a relatively high permeability over a first predetermined electromagnetic energy intensity range; (b) a second layer of ferromagnetic material having opposing major surfaces, one of said major surfaces being contiguous with one of the major surfaces of said first layer, said second layer having a relatively high permeability over a second predetermined electromagnetic energy intensity range different from said first range; and (c) a layer of highly electrically conductive material on the non-contiguous major surfaces of said first and second layers.
Claim 2
Dependent Claim
101 words
A shield material for electromagnetic radiations comprising: (a) a first layer of ferromagnetic material having opposing major surfaces and having a relatively high permeability over a first predetermined electromagnetic energy intensity range; (b) a second layer of ferromagnetic material having opposing major surfaces, one of said major surfaces being contiguous with one of the major surfaces of said first layer, said second layer having a relatively high permeability over a second predetermined electromagnetic energy intensity range different from said first range; and (c) a layer of highly electrically conductive material on the non-contiguous major surfaces of said first and second layers.
Claim 3
Dependent Claim
25 words
A shield material as set forth in claim 1 wherein said second electromagnetic energy intensity range is lower than said first electromagnetic energy intensity range.
Claim 4
Dependent Claim
35 words
A shield material as set forth in claim 1 wherein said first layer is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 5
Dependent Claim
35 words
A shield material as set forth in claim 2 wherein said first layer is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 6
Dependent Claim
19 words
A shield material as set forth in claim 1 wherein said layer of highly electrically conductive material is copper.
Claim 7
Dependent Claim
19 words
A shield material as set forth in claim 2 wherein said layer of highly electrically conductive material is copper.
Claim 8
Dependent Claim
19 words
A shield material as set forth in claim 3 wherein said layer of highly electrically conductive material is copper.
Claim 9
Dependent Claim
19 words
A shield material as set forth in claim 4 wherein said layer of highly electrically conductive material is copper.
Claim 10
Dependent Claim
73 words
A shield material for electromagnetic radiations comprising: (a) a laminated member comprising a plurality of contiguous layers of ferromagnetic material, each said layer of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from layer to layer in a predetermined direction; and (b) a layer of highly electrically conductive material on the outer surfaces of said laminated member.
Claim 11
Dependent Claim
73 words
A shield material for electromagnetic radiations comprising: (a) a laminated member comprising a plurality of contiguous layers of ferromagnetic material, each said layer of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from layer to layer in a predetermined direction; and (b) a layer of highly electrically conductive material on the outer surfaces of said laminated member.
Claim 12
Dependent Claim
35 words
A shield material as set forth in claim 9 wherein said ferromagnetic material is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 13
Dependent Claim
18 words
A shield material as set forth in claim 9 wherein said laminated ember comprises at least three layers.
Claim 14
Dependent Claim
18 words
A shield material as set forth in claim 10 wherein said laminated member comprises at least three layers.
Claim 15
Dependent Claim
19 words
A shield material as set forth in claim 9 wherein said layer of highly electrically conductive material is copper.
Claim 16
Dependent Claim
19 words
A shield material as set forth in claim 10 wherein said layer of highly electrically conductive material is copper.
Claim 17
Dependent Claim
19 words
A shield material as set forth in claim 11 wherein said layer of highly electrically conductive material is copper.
Claim 18
Dependent Claim
19 words
A shield material as set forth in claim 12 wherein said layer of highly electrically conductive material is copper.
Claim 19
Dependent Claim
82 words
A shield material for electromagnetic radiations, comprising: (a) a first layer of ferromagnetic material having opposing major surfaces and having a relatively high permeability over a first predetermined electromagnetic energy intensity range; and (b) a second layer of ferromagnetic material having opposing major surfaces, one of said major surfaces being contiguous with one of the major surfaces of said first layer, said second layer having a relatively high permeability over a second predetermined electromagnetic energy intensity range different from said first range.
Claim 20
Dependent Claim
82 words
A shield material for electromagnetic radiations, comprising: (a) a first layer of ferromagnetic material having opposing major surfaces and having a relatively high permeability over a first predetermined electromagnetic energy intensity range; and (b) a second layer of ferromagnetic material having opposing major surfaces, one of said major surfaces being contiguous with one of the major surfaces of said first layer, said second layer having a relatively high permeability over a second predetermined electromagnetic energy intensity range different from said first range.
Claim 21
Dependent Claim
25 words
A shield material as set forth in claim 17 wherein said second electromagnetic energy intensity range is lower than said first electromagnetic energy intensity range.
Claim 22
Dependent Claim
35 words
A shield material as set forth in claim 17 wherein said first layer is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 23
Dependent Claim
35 words
A shield material as set forth in claim 18 wherein said first layer is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 24
Dependent Claim
55 words
A shield material for electromagnetic radiations comprising: a laminated member comprising a plurality of contiguous layers of ferromagnetic material, each said layer of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from layer to layer in a predetermined direction.
Claim 25
Dependent Claim
55 words
A shield material for electromagnetic radiations comprising: a laminated member comprising a plurality of contiguous layers of ferromagnetic material, each said layer of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from layer to layer in a predetermined direction.
Claim 26
Dependent Claim
35 words
A shield material as set forth in claim 21 wherein said ferromagnetic material is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 27
Dependent Claim
18 words
A shield material as set forth in claim 21 wherein said laminated member comprises at least three layers.
Claim 28
Dependent Claim
18 words
A shield material as set forth in claim 22 wherein said laminated member comprises at least three layers.
Claim 29
Independent Claim
115 words
A method of shielding against electromagnetic radiations, comprising the steps of: (a) determining the direction of electromagnetic radiations to be shielded; (b) providing an electromagnetic shielding material comprising a plurality of adjacent members of ferromagnetic material, each said member of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from member to member in a predetermined direction and a highly electrically conductive material on opposed sides of said ferromagnetic material; and (c) positioning said shielding material so that said electromagnetic radiations to be shielded impinge upon said members in the order of higher to lower predetermined electromagnetic energy intensity range.
Claim 30
Independent Claim
115 words
A method of shielding against electromagnetic radiations, comprising the steps of: (a) determining the direction of electromagnetic radiations to be shielded; (b) providing an electromagnetic shielding material comprising a plurality of adjacent members of ferromagnetic material, each said member of ferromagnetic material having a predetermined high permeability over a predetermined electromagnetic energy intensity range, the intensity of said predetermined electromagnetic energy intensity range diminishing from member to member in a predetermined direction and a highly electrically conductive material on opposed sides of said ferromagnetic material; and (c) positioning said shielding material so that said electromagnetic radiations to be shielded impinge upon said members in the order of higher to lower predetermined electromagnetic energy intensity range.
Claim 31
Dependent Claim
34 words
A method as set forth in claim 25 wherein said ferromagnetic material is taken from the class consisting of permendur and nickel-iron containing alloys having from about 42 to about 80 weight percent nickel.
Claim 32
Dependent Claim
19 words
A method as set forth in claim 25 wherein said plurality of members comprises at least three such members.
Claim 33
Dependent Claim
18 words
A method as set forth in claim 26 wherein plurality of members comprises at least three such members.
Claim 34
Dependent Claim
16 words
A method as set forth in claim 25 wherein said highly electrically conductive material is copper.
Claim 35
Dependent Claim
16 words
A method as set forth in claim 26 wherein said highly electrically conductive material is copper.
Claim 36
Dependent Claim
16 words
A method as set forth in claim 27 wherein said highly electrically conductive material is copper.
Claim 37
Dependent Claim
16 words
A method as set forth in claim 28 wherein said highly electrically conductive material is copper.
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |