US5760335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation of electromagnetic distortion caused by metal mass
Assignee: Elbit Systems Ltd
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Filing: 1994-08-01
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Granted: 1998-06-02
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Expires: 2014-08-01
Abstract
Abstract A shield for electromagnetic radiation including a first layer having a high magnetic permeability and a second layer having a high electrical conductivity.
Inventors
- 👤 Pinhas Gilboa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:18
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0088; H01; H01J; H01J2229/00; H01J2229/0007; H01J2229/0015
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
164 words
A shield for electromagnetic radiation comprising: a first layer having a high magnetic permeability; and a second layer having a high electrical conductivity, at least one of said first and second layers having a plurality of apertures formed therein, said apertures being operative to reduce the effect of the shield on the electromagnetic field outside the shield, wherein said plurality of apertures comprise a plurality of generally "U"-shaped slots, wherein said shield has a generally cylindrical shape of a given length, wherein said first layer comprises an inner portion, and said second layer comprises an outer portion of said generally cylindrical shape, wherein each of said "U"-shaped slots comprises a lengthwise slit and two circumferential slits in said second layer, wherein said circumferential slits are generally perpendicular to said lengthwise slit and communicate with the ends of said lengthwise slit, and wherein said two circumferential slits are separated from a nearby lengthwise slit of an adjacent "U"-shaped slot by a solid conducting material surface.
Claim 2
Dependent Claim
164 words
A shield for electromagnetic radiation comprising: a first layer having a high magnetic permeability; and a second layer having a high electrical conductivity, at least one of said first and second layers having a plurality of apertures formed therein, said apertures being operative to reduce the effect of the shield on the electromagnetic field outside the shield, wherein said plurality of apertures comprise a plurality of generally "U"-shaped slots, wherein said shield has a generally cylindrical shape of a given length, wherein said first layer comprises an inner portion, and said second layer comprises an outer portion of said generally cylindrical shape, wherein each of said "U"-shaped slots comprises a lengthwise slit and two circumferential slits in said second layer, wherein said circumferential slits are generally perpendicular to said lengthwise slit and communicate with the ends of said lengthwise slit, and wherein said two circumferential slits are separated from a nearby lengthwise slit of an adjacent "U"-shaped slot by a solid conducting material surface.
Claim 3
Dependent Claim
24 words
A shield according to claim 1 wherein the accumulated width of said lengthwise slits is equal to approximately 2.9 percent of the cylinder length.
Claim 4
Dependent Claim
27 words
A shield according to claim 1 and wherein said lengthwise slit has a length of approximately 34 percent of said given length of said generally cylindrical shape.
Claim 5
Dependent Claim
29 words
A shield according to claim 1 and comprising a plurality of said "U"-shaped slots, uniformly distributed at the central part of the circumferential surface of said generally cylindrical shape.
Claim 6
Dependent Claim
29 words
A shield according to claim 2 and comprising a plurality of said "U"-shaped slots, uniformly distributed at the central part of the circumferential surface of said generally cylindrical shape.
Claim 7
Dependent Claim
36 words
A shield according to claim 1 and wherein said solid conducting material surface separating said two circumferential slits from a nearby said lengthwise slit is substantially smaller than the length of each of said circumferential slits.
Claim 8
Dependent Claim
36 words
A shield according to claim 2 and wherein said solid conducting material surface separating said two circumferential slits from a nearby said lengthwise slit is substantially smaller than the length of each of said circumferential slits.
Claim 9
Dependent Claim
36 words
A shield according to claim 4 and wherein said solid conducting material surface separating said two circumferential slits from a nearby said lengthwise slit is substantially smaller than the length of each of said circumferential slits.
Claim 10
Dependent Claim
36 words
A shield according to claim 5 and wherein said solid conducting material surface separating said two circumferential slits from a nearby said lengthwise slit is substantially smaller than the length of each of said circumferential slits.
Claim 11
Dependent Claim
38 words
A shield according to claim 1 and wherein at least one of dimensions of said "U"-shaped slots and thicknesses of said first and second layers are selected to reduce the electromagnetic field distortion over selected groups of frequencies.
Claim 12
Dependent Claim
38 words
A shield according to claim 2 and wherein at least one of dimensions of said "U"-shaped slots and thicknesses of said first and second layers are selected to reduce the electromagnetic field distortion over selected groups of frequencies.
Claim 13
Dependent Claim
30 words
A shield according to claim 1 wherein the first and second layers are configured to produce fields having substantially opposite dipole moments in the presence of an external electromagnetic field.
Claim 14
Dependent Claim
19 words
A shield according to claim 11 wherein the at least one of dimensions and thickness are selected by experimentation.
Claim 15
Dependent Claim
19 words
A shield according to claim 10 wherein the at least one of dimensions and thickness are selected by experimentation.
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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) | 2001-06-01 | 2001-12-01 | 2002-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-01 | 2005-12-01 | 2006-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-01 | 2009-12-01 | 2010-06-02 | $7700.00 | Window Closed / Lapsed |