US3693046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodes with treated apertures for interconnecting gas cells of a display panel
Assignee: Unisys Corp
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Filing: 1970-02-26
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Granted: 1972-09-19
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Expires: 1990-02-26
Abstract
Abstract A display panel including a lower layer and an upper layer of gas-filled cells with cathodes in common between the layers and with separate anodes associated with each layer of cells, tiny apertures in the cathodes interconnecting upper and lower cells, having improved cathodes wherein the surfaces in the apertures of the cathodes are treated to increase their work function so that these surfaces do not support cathode glow in the operating conditions of the panel, thus preventing spurious transfer of cathode glow from the lower scanning to the upper visible layer of cells.
Inventors
- 👤 David Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:26
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H01J17/494
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
In a cathode for use in common between two layers of gas cells in a display device wherein individual cells in each layer are interconnected by an aperture of very small diameter, means on tHe inner surface of at least one of said apertures for increasing the work function of said surface relative to the outer surfaces proximate the ends of said aperture whereby said inner surface does not support cathode glow under working conditions of the interconnected cells.
Claim 2
Dependent Claim
79 words
In a cathode for use in common between two layers of gas cells in a display device wherein individual cells in each layer are interconnected by an aperture of very small diameter, means on tHe inner surface of at least one of said apertures for increasing the work function of said surface relative to the outer surfaces proximate the ends of said aperture whereby said inner surface does not support cathode glow under working conditions of the interconnected cells.
Claim 3
Dependent Claim
13 words
The cathode of claim 1 wherein said means is a thin insulating coating.
Claim 4
Dependent Claim
13 words
The cathode of claim 2 wherein said insulating coating is an oxidized layer.
Claim 5
Dependent Claim
102 words
A display panel comprising: at least one pair of gas cells having a cathode in common therebetween, said cathode having an aperture therein of not more than 3 mil diameter for interconnecting said pair, means for maintaining cathode glow around said aperture in one of said at least one pair of gas cells, selective means for spreading said cathode glow into the other of said at least one pair of gas cells, and means on the inner surface of said aperture for preventing the spread of said cathode glow into said other cell in the absence of activation of said selective means.
Claim 6
Dependent Claim
102 words
A display panel comprising: at least one pair of gas cells having a cathode in common therebetween, said cathode having an aperture therein of not more than 3 mil diameter for interconnecting said pair, means for maintaining cathode glow around said aperture in one of said at least one pair of gas cells, selective means for spreading said cathode glow into the other of said at least one pair of gas cells, and means on the inner surface of said aperture for preventing the spread of said cathode glow into said other cell in the absence of activation of said selective means.
References Cited (Backward Citations)
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |