US3697797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing cold cathode gas discharge devices and the product thereof
Assignee: WALTER E HELLER WESTERN Inc
•
Filing: 1971-01-25
•
Granted: 1972-10-10
•
Expires: 1991-01-25
Abstract
Abstract The invention comprises a process of manufacturing cold cathode gas discharge devices. A unitary metal electrode structure is inserted through a glass support, the metal and glass having the same coefficient of thermal expansion. The support and electrode structure are heated in the presence of oxygen to effect a seal therebetween. The gas discharge device is completed without removing the oxide coating formed on the electrode surfaces of the structure during the heating step. The resulting gas discharge device, which may be used for display purposes, has a stable oxide coating on electrodes thereof that attenuates display distorting reflections.
Inventors
- 👤 Paul J Freyheit
- 👤 Claude D Lustig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:05
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/022; H01J9/025; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/491
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
In a process for manufacturing cold cathode gas discharge devices comprising thE steps of inserting a metal alloy electrode structure into a glass support, said alloy consisting of approximately 49 percent iron and 51 percent nickel, said glass having the same coefficient of thermal expansion as said alloy, heating said support and electrode structure in the presence of oxygen at a softening temperature of said glass to effect a seal therebetween, and completing said devices without removing the oxide coating formed on the electrode surfaces of said structure during said heating step.
Claim 2
Dependent Claim
92 words
In a process for manufacturing cold cathode gas discharge devices comprising the steps of inserting a metal alloy cathode rod through a glass support, said alloy consisting of approximately 49 percent iron and 51 percent nickel, said glass having the same coefficient of thermal expansion as said alloy, heating said support and cathode rod in the presence of oxygen at a softening temperature of said glass to effect a seal therebetween, and completing said devices without removing the oxide coating formed on the cathodic surfaces of said rod during said heating step.
Claim 3
Dependent Claim
81 words
In a process for manufacturing cold cathode gas discharge devices comprising the steps of inserting a metal alloy cathode rod through a soda-lime glass support, said alloy consisting of approximately 49 percent iron and 51 percent nickel, heating said support and cathode rod in the presence of oxygen at a softening temperature of said glass to effect a seal therebetween, and completing said devices without removing the oxide coating formed on the cathodic surfaces of said structure during said heating step.
Claim 4
Dependent Claim
50 words
In a cold cathode gas discharge display device glass support means, and metal electrode means sealed in said support means, the electrode surfaces of said electrode means being coated with a non-reflective oxide formed thereon by heating in the presence of oxygen thereby attenuating display distorting reflections from said surfaces.
Claim 5
Dependent Claim
61 words
In the device of claim 5 in which said metal comprises an alloy consisting of approximately 49 percent iron and 51 percent nickel, said oxide comprises a mat black oxide formed on said surfaces by heating in the presence of oxygen at a softening temperatures of said glass, and said glass has the same coefficient of thermal expansion as said alloy.
Claim 6
Dependent Claim
30 words
In the device of claim 6 in which said glass comprises soda-lime glass, said electrode means comprises cathode means, and said surfaces comprise the cathodic surfaces of said cathode means.
Claim 7
Dependent Claim
34 words
In the device of claim 7 in which said cathode means comprises a unitary piece of said alloy, a portion thereof being sealed to said glass and another portion thereof forming said cathodic surfaces.
Claim 8
Dependent Claim
17 words
In the device of claim 7 in which said cathode means comprises a rod of said alloy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |