Patent US4454449A successfully refreshed from Google Patents.
US4454449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected electrodes for plasma panels
Assignee: NCR Voyix Corp
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Filing: 1982-06-30
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Granted: 1984-06-12
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Expires: 2002-06-30
Abstract
Abstract A metal oxide coating is applied between the conductive base and the magnesium oxide dielectric of the input and/or erase electrode(s) in a plasma display device to prevent break-down of the dielectric.
Inventors
- 👤 Stacy W. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:09
CPC Classifications
H; H01; H01J; H01J11/00; H01J11/10; H01J11/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
An improved plasma transfer display device comprising: at least one envelope defining a channel containing an ionizable medium; and an electrode located within said channel for initiating or terminating a plasma discharge of the ionizable medium proximate the electrode, said electrode comprising a conductive base a layer of magnesium oxide and a dielectric coating consisting essentially of a ruthenium oxide in a glass matrix and having a sheet resistivity of less than about 10 megohms per square formed between said conductive base and said magnesium oxide layer, said dielectric coating permitting direct coupling of the electrode with the ionizable medium and preventing contamination and breakdown of said magnesium oxide layer by said electrode during operation of the device.
Claim 2
Dependent Claim
118 words
An improved plasma transfer display device comprising: at least one envelope defining a channel containing an ionizable medium; and an electrode located within said channel for initiating or terminating a plasma discharge of the ionizable medium proximate the electrode, said electrode comprising a conductive base a layer of magnesium oxide and a dielectric coating consisting essentially of a ruthenium oxide in a glass matrix and having a sheet resistivity of less than about 10 megohms per square formed between said conductive base and said magnesium oxide layer, said dielectric coating permitting direct coupling of the electrode with the ionizable medium and preventing contamination and breakdown of said magnesium oxide layer by said electrode during operation of the device.
Claim 3
Dependent Claim
74 words
A contamination-resistant, voltage breakdown-resistant electrode for a gaseous discharge device for initiating or terminating said discharge, comprising: a conductive base; a dielectric layer formed on the conductive base consisting essentially of ruthenium oxide in a glass matrix and having a sheet resistivity of less than about 10 megohms per square, said dielectric permitting direct coupling of said electrode with the gas; and a magnesium oxide dielectric layer formed on said ruthenium oxide dielectric layer.
Claim 4
Dependent Claim
74 words
A contamination-resistant, voltage breakdown-resistant electrode for a gaseous discharge device for initiating or terminating said discharge, comprising: a conductive base; a dielectric layer formed on the conductive base consisting essentially of ruthenium oxide in a glass matrix and having a sheet resistivity of less than about 10 megohms per square, said dielectric permitting direct coupling of said electrode with the gas; and a magnesium oxide dielectric layer formed on said ruthenium oxide dielectric layer.
References Cited (Backward Citations)
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Cited
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Cited
US3775764A
Cited
US4027197A
Cited
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Cited
US4340840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |