US3842313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple character gas discharge display device
Assignee: US Philips Corp
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Filing: 1972-12-21
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Granted: 1974-10-15
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Expires: 1992-12-21
Abstract
Abstract In a multiple segment digit tube, auxiliary anodes are provided near the digits and there is a common main anode. The tube is controlled with negative pulses on the cathode segments and positive capacitively supplied pulses on the auxiliary anodes. All pulses are derived from a single MOST circuit.
Inventors
- 👤 W Koteris
- 👤 Daelen H Van
- 👤 A Hendriks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:36
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/491
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A multiple-character gas discharge display device comprising an envelope filled with an ionizable gas, a plurality of narrow strip-shaped cathode elements arranged in a plurality of juxtaposed matrix groups for displaying characters by a cathode glow discharge, a plurality of stacked connection strips connecting corresponding cathode elements in each matrix group, strips of insulating material between and separating said cathode connection strips, said strips having apertures therein through which said cathode matrix groups are visible, a continuous conductive strip constituting an anode at the base of said stacks, a grid-like auxiliary anode between each matrix group and said anode, and an insulation strip between the auxiliary anodes and the conductive strip anode.
Claim 2
Dependent Claim
112 words
A multiple-character gas discharge display device comprising an envelope filled with an ionizable gas, a plurality of narrow strip-shaped cathode elements arranged in a plurality of juxtaposed matrix groups for displaying characters by a cathode glow discharge, a plurality of stacked connection strips connecting corresponding cathode elements in each matrix group, strips of insulating material between and separating said cathode connection strips, said strips having apertures therein through which said cathode matrix groups are visible, a continuous conductive strip constituting an anode at the base of said stacks, a grid-like auxiliary anode between each matrix group and said anode, and an insulation strip between the auxiliary anodes and the conductive strip anode.
Claim 3
Dependent Claim
30 words
A gas discharge display device as claimed in claim 1, including a gauze covering each of the matrix groups on the side remote from the anode and the auxiliary anodes.
Claim 4
Dependent Claim
37 words
A device having a gas discharge tube as claimed in claim 1 including means for supplying voltage pulses of opposite sign to the auxiliary anode and the cathode strips for producing a discharge in a matrix group.
Claim 5
Dependent Claim
18 words
A device as claimed in claim 3, wherein the voltage pulses are capacitively supplied to the auxiliary anodes.
Claim 6
Dependent Claim
29 words
A device as claimed in claim 3 including means to supply a negative discharge pulse to the auxiliary anode at the end of the discharge to a matrix group.
Claim 7
Dependent Claim
39 words
A device as claimed in claim 3, including switching means for supplying pulses to the auxiliary anodes and the cathodes which form part of a single MOST circuit of the P-channel type, the N-channel type or the complementary type.
References Cited (Backward Citations)
US3641383A
Cited
US3742279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |