Patent US4910090A successfully refreshed from Google Patents.
US4910090A
Expired / Lapsed
US
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EMI/RFI shield for visual display terminals
Assignee: Southwall Technologies Inc
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Filing: 1987-10-21
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Granted: 1990-03-20
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Expires: 2007-10-21
Abstract
Abstract A multilayer composite EMI/RFI filter for use in front of visual displays is disclosed to be constructed of a shaped or shapable plastic substrate having an outer diffuse hardcoat and one or more conductor transmissive layers of metal. Preferably the metal is presented as a sputter-deposited dielectric-metal-dielectric stack.
Inventors
- 👤 Bruce E. Kuhlman
- 👤 Gerald R. Behling
- 👤 James E. Kloss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/868; H04; H04N; H04N5/00; H04N5/64; H04N5/65; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and an inner conductive layer, said conductive layer comprising a continuous nonmesh metal film layer intermediate dielectric layers, said conductive layer having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layer being connected on substantially its entire periphery to a groundable conductor.
Claim 2
Dependent Claim
97 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and an inner conductive layer, said conductive layer comprising a continuous nonmesh metal film layer intermediate dielectric layers, said conductive layer having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layer being connected on substantially its entire periphery to a groundable conductor.
Claim 3
Dependent Claim
23 words
The transparent EMI-RFI shield of claim 1 wherein the plastic substrate is tinted or pigmented to give a transmittance between 30 and 100%.
Claim 4
Dependent Claim
18 words
The transparent EMI/RFI shield of claim 1 having a resistance of less than about 5 ohms per square.
Claim 5
Dependent Claim
11 words
The transparent EMI/RFI shield of claim 1 having a curved cross-section.
Claim 6
Dependent Claim
11 words
The transparent EMI/RFI shield of claim 1 having a flat cross-section.
Claim 7
Dependent Claim
23 words
The transparent EMI/RFI shield of claim 1 wherein the metal layer comprises a continuous nonmesh 100 to 500 angstrom layer of conductive metal.
Claim 8
Dependent Claim
12 words
The transparent EMI/RFI shield of claim 6 wherein the metal comprises silver.
Claim 9
Dependent Claim
101 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and an inner conductive layer, said conductive layer comprising a plurality of continuous metal layers bounded by and separated by dielectric layers said conductive layer having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layer being connected on substantially its entire periphery to a groundable conductor.
Claim 10
Dependent Claim
101 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and an inner conductive layer, said conductive layer comprising a plurality of continuous metal layers bounded by and separated by dielectric layers said conductive layer having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layer being connected on substantially its entire periphery to a groundable conductor.
Claim 11
Dependent Claim
12 words
The transparent EMI/RFI shield of claim 8 wherein the plurality is two.
Claim 12
Dependent Claim
12 words
The transparent EMI/RFI shield of claim 8 wherein the plurality is three.
Claim 13
Dependent Claim
12 words
The transparent EMI/RFI shield of claim 9 wherein the metal comprises silver.
Claim 14
Dependent Claim
13 words
The transparent EMI/RFI shield of claim 11 wherein the dielectric comprises metal oxide.
Claim 15
Dependent Claim
105 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and two dielectric/continuous metal/dielectric conductive layers--one on either side of the plastic substrate said conductive layers each comprising a continuous metal film layer intermediate dielectric layers, said conductive layers having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layers being connected on substantially their entire periphery to a groundable conductor.
Claim 16
Dependent Claim
105 words
A transparent EMI/RFI shield for use in front of a visual display comprising: an outer layer of diffuse nonglare hard-coat; an intermediate plastic substrate, said substrate being sized and shaped to conform to the visual display; and two dielectric/continuous metal/dielectric conductive layers--one on either side of the plastic substrate said conductive layers each comprising a continuous metal film layer intermediate dielectric layers, said conductive layers having a transmittance over the visual spectrum of at least about 30% and having an electrical resistance of less than about 10 ohms per square, and said conductive layers being connected on substantially their entire periphery to a groundable conductor.
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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) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |