Patent US4130778A successfully refreshed from Google Patents.
US4130778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC PDP with divided cathode
Assignee: Siemens AG
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Filing: 1977-09-22
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Granted: 1978-12-19
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Expires: 1997-09-22
Abstract
Abstract In a pictorial display device containing a matrix of gas discharge cells in which discharge path is divided into an auxiliary discharge space for operation with low voltage, followed by a second space with short path length and high field intensity for accelerating the electrons, the cathode is subdivided into subcathodes with each of which a group of auxiliary anodes is associated to obtain a narrow, approximately wedge-shaped gas discharge which is fired and passed on line by line.
Inventors
- 👤 David W. Branston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:23
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H01J17/498
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
In a pictorial display device with a matrix of gas discharge cells which include an anode and a cathode and having associated auxiliary anodes for controlling the rows and control electrodes for the brightness control of the columns with an auxiliary gas discharge path between the cathode and the auxiliary anodes and an electron acceleration path between the control electrodes and the anode, the improvement comprising the cathode being made up of a plurality of subcathodes and each of said subcathodes being associated with a group of auxiliary anodes.
Claim 2
Dependent Claim
89 words
In a pictorial display device with a matrix of gas discharge cells which include an anode and a cathode and having associated auxiliary anodes for controlling the rows and control electrodes for the brightness control of the columns with an auxiliary gas discharge path between the cathode and the auxiliary anodes and an electron acceleration path between the control electrodes and the anode, the improvement comprising the cathode being made up of a plurality of subcathodes and each of said subcathodes being associated with a group of auxiliary anodes.
Claim 3
Dependent Claim
20 words
The improvement according to claim 1, wherein each subcathode is associated with a group of at least three auxiliary anodes.
Claim 4
Dependent Claim
37 words
The improvement according to claim 2, wherein one auxiliary anode of each group is coupled in parallel with a corresponding auxiliary anode in all other groups and to a common control means thereby forming a common phase.
Claim 5
Dependent Claim
21 words
The improvement according to claim 3 and further including a resetting discharge path associated with the auxiliary discharge paths for pre-ionization.
Claim 6
Dependent Claim
37 words
The improvement according to claim 1, wherein one auxiliary anode of each group is coupled in parallel with a corresponding auxiliary anode in all other groups and to a common control means thereby forming a common phase.
Claim 7
Dependent Claim
21 words
The improvement according to claim 5 and further including a resetting discharge path associated with the auxiliary discharge paths for pre-ionization.
Claim 8
Dependent Claim
21 words
The improvement according to claim 1 and further including a resetting discharge path associated with the auxiliary discharge paths for pre-ionization.
References Cited (Backward Citations)
US3956667A
Cited
US3956667B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |