Patent US5264268B1 successfully refreshed from Google Patents.
US5360941A
Expired / Lapsed
US
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Magnetically permeable electrostatic shield
Assignee: Cubic Automatic Revenue Collection Group
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Filing: 1991-10-28
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Granted: 1994-11-01
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Expires: 2011-10-28
Abstract
Abstract A permeable electrostatic shielding method and apparatus is disclosed that is suitable for use in shielding portable electronic devices such as calculators, smart cards and radios. Such electronic devices require protection from the electrostatic discharge occurring when a user accumulates an electrostatic charge and contacts a conducting surface of the electronic device. The resulting electrostatic discharge creates capacitively-coupled voltage transients in the digital circuits within the electronic device. The present invention prevents local charge accumulation on the surfaces of such electronic devices, which transmit and receive electromagnetic radio waves, without blocking the electromagnetic radiation essential to device function. One embodiment of this permeable electrostatic shield is formed by depositing a conductive layer of controlled thickness comprising a plurality of closely-spaced conductors that are electrically connected at one end to form a practical electrostatic shield permeable to RF electromagnetic radiation above 15 MHz.
Inventors
- 👤 John B. Roes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:24
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0079; G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/073; G06K19/07309; G06K19/07318; G06K19/07327; H05F; H05F1/00; H05F1/02; H05F3/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
84 words
A magnetically permeable, electrostatically shielded device, comprising: an electronic device; a pouch-like container enclosing said electronic device; the container comprising a non-conductive supporting surface of flexible material having a conductive shielding layer, said layer consisting essentially of at least one plurality of parallel conductive strips, each said strip having a first and a second end, with said first ends conductively joined to a conductive termination; and said supporting surface being folded over upon itself and joined at the edges to form a pouch-like container.
Claim 2
Dependent Claim
84 words
A magnetically permeable, electrostatically shielded device, comprising: an electronic device; a pouch-like container enclosing said electronic device; the container comprising a non-conductive supporting surface of flexible material having a conductive shielding layer, said layer consisting essentially of at least one plurality of parallel conductive strips, each said strip having a first and a second end, with said first ends conductively joined to a conductive termination; and said supporting surface being folded over upon itself and joined at the edges to form a pouch-like container.
Claim 3
Dependent Claim
28 words
The shielded device described in claim 1 wherein said supporting surface comprises at least one material selected from a group consisting essentially of aromatic polyamide, polyester, and polyethylene.
Claim 4
Dependent Claim
29 words
The shielded device described in claim 1 wherein said shielding layer comprises at least one material selected from a group consisting essentially of copper, silver, zinc, aluminum and gold.
Claim 5
Dependent Claim
19 words
The shielded device described in claim 1 wherein said conductive termination is conductively connected to a local ground potential.
Claim 6
Dependent Claim
17 words
The shielded device described in claim 1 wherein the spacing between said parallel conductive strips is uniform.
Claim 7
Dependent Claim
75 words
A magnetically permeable, electrostatically shielded device comprising an electronic device, an outer housing enclosing said device, said housing comprising a plurality of supporting walls joined together to form a box-like enclosure, each said wall having a non-conductive supporting surface and a conductive shielding layer consisting essentially of at least one plurality of parallel conductive strips, each said strip having a first and a second end, with said first end conductively joined to a conductive termination.
Claim 8
Dependent Claim
75 words
A magnetically permeable, electrostatically shielded device comprising an electronic device, an outer housing enclosing said device, said housing comprising a plurality of supporting walls joined together to form a box-like enclosure, each said wall having a non-conductive supporting surface and a conductive shielding layer consisting essentially of at least one plurality of parallel conductive strips, each said strip having a first and a second end, with said first end conductively joined to a conductive termination.
Claim 9
Dependent Claim
20 words
The shielded device described in claim 6 wherein each said conductive termination is conductively connected to a local ground potential.
Claim 10
Dependent Claim
17 words
The shielded device described in claim 6 wherein the spacing between said parallel conductive strips is uniform.
Claim 11
Dependent Claim
103 words
An electrostatically shielded device, permeable to electromagnetic radiation at a selected frequency, comprising: an electronic device; an outer container enclosing said electronic device; the outer container comprising a single non-conductive supporting surface having a conductive shielding layer, said shielding layer consisting essentially of a continuous surface of conductive material, said conductive material having an electromagnetic skin penetration depth at said selected frequency, and said shielding layer having a thickness of less than the electromagnetic skin penetration depth for said material at said frequency; the shielding layer comprising means for shielding against electrostatic discharge while permitting transmission of electromagnetic radiation at said selected frequency.
Claim 12
Dependent Claim
103 words
An electrostatically shielded device, permeable to electromagnetic radiation at a selected frequency, comprising: an electronic device; an outer container enclosing said electronic device; the outer container comprising a single non-conductive supporting surface having a conductive shielding layer, said shielding layer consisting essentially of a continuous surface of conductive material, said conductive material having an electromagnetic skin penetration depth at said selected frequency, and said shielding layer having a thickness of less than the electromagnetic skin penetration depth for said material at said frequency; the shielding layer comprising means for shielding against electrostatic discharge while permitting transmission of electromagnetic radiation at said selected frequency.
Claim 13
Dependent Claim
13 words
The shielded device described in claim 9 wherein said supporting surface is flexible.
Claim 14
Dependent Claim
28 words
The shielded device described in claim 10 wherein said supporting surface comprises at least one material selected from a group consisting essentially of aromatic polyamide, polyester, and polyethylene.
Claim 15
Dependent Claim
29 words
The shielded device described in claim 9 wherein said conductive material comprises at least one material selected from a group consisting essentially of copper, silver, zinc, aluminum and gold.
Claim 16
Dependent Claim
23 words
The device as claimed in claim 9, wherein the shielding layer has a thickness of less than 20% of the skin penetration depth.
Claim 17
Dependent Claim
21 words
The device as claimed in claim 13, wherein the shielding layer has a thickness of 10% of the skin penetration depth.
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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) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |