US3881131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge display panel system with probe for igniting and extinguishing cells
Assignee: WALTER E HELLER WESTERN Inc
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Filing: 1972-03-18
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Granted: 1975-04-29
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Expires: 1992-03-18
Abstract
Abstract Apparatus including an external voltageless or grounded probe for selectively writing and erasing information on a gas discharge plasma display panel matrix. The plasma panel cells contain an ionizable gas and are subjected to a sustaining voltage. Proximity of the probe to a selected cell varies the field strength within the cell and accordingly ionizes or deionizes gas depending on whether the front or rear electrodes of the panel are grounded.
Inventors
- 👤 Dan J Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:01
CPC Classifications
H; H01; H01J; H01J11/00; H01J11/10; H01J11/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
In a gas discharge plasma display panel system including an a.c. gas discharge display cell for containing an ionizable gas, the combination comprising first and second electrode means disposed on either side of said cell, respectively, for applying an a.c. gas discharge sustaining potential thereacross by connection to a source of a.c. gas discharge sustaining potential, said first electrode means being constructed to expose a portion of said cell, selective connection means coupled to said first and second electrode means for selectively grounding either said first or said second electrode means, and passive probe means of electrically conductive material positionable in proximity to said exposed portion of said cell for selectively igniting or extinguishing a gas discharge in said cell in accordance with said selective connection means grounding said first or said second electrode means respectively and said probe positioned in proximity to said exposed portion of said cell.
Claim 2
Dependent Claim
149 words
In a gas discharge plasma display panel system including an a.c. gas discharge display cell for containing an ionizable gas, the combination comprising first and second electrode means disposed on either side of said cell, respectively, for applying an a.c. gas discharge sustaining potential thereacross by connection to a source of a.c. gas discharge sustaining potential, said first electrode means being constructed to expose a portion of said cell, selective connection means coupled to said first and second electrode means for selectively grounding either said first or said second electrode means, and passive probe means of electrically conductive material positionable in proximity to said exposed portion of said cell for selectively igniting or extinguishing a gas discharge in said cell in accordance with said selective connection means grounding said first or said second electrode means respectively and said probe positioned in proximity to said exposed portion of said cell.
Claim 3
Dependent Claim
19 words
In the system of claim 1 in which said probe means comprises a passive probe without electrical connection thereto
Claim 4
Dependent Claim
16 words
In the system of claim 1 in which said probe means comprises a passive grounded probe.
Claim 5
Dependent Claim
47 words
In the system of claim 1 in which said first electrode means coMprises an electrode having an aperture adjacent said cell thereby exposing said portion thereof, said probe means includes a tip of electrically conductive material having a surface area at least as large as said aperture.
Claim 6
Dependent Claim
32 words
In the system of claim 1 in which said first electrode means comprises an electrode having a width adjacent said cell less than that of said cell thereby exposing said portion thereof.
Claim 7
Dependent Claim
71 words
In the system of claim 1 in which said gas discharge display cell comprises a central member having a cavity for containing said ionizable gas, and first and second electrically insulating members disposed on either side of said central member and sealing either side of said cavity for electrically insulating said first and second electrode means from said cavity, respectively, thereby providing capacitive coupling between said electrode means and said cavity.
References Cited (Backward Citations)
US2858480A
Cited
US3559307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |