Patent US3908252A successfully refreshed from Google Patents.
US3908252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge tube provided with an electrode comprising nickel and aluminum
Assignee: US Philips Corp
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Filing: 1973-08-20
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Granted: 1975-09-30
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Expires: 1993-08-20
Abstract
Abstract The invention relates to a gas and/or vapour discharge tube provided with an electrode consisting of several metal layers running parallel to one another. According to the invention the electrode consists of niferal material (nickel, iron, aluminum) which has been subjected to a given thermal treatment so that the discharge only terminates on the nickel layer.
Inventors
- 👤 Henricus Gerardus Anto Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:40
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
METHOD OF MANUFACTRUING A GAS OR VAPOUR DISCHARGE TUBE IN WHICH THE DISCHARGE TUBE IS PROVIDED WITH AN INTERNAL ELECTRIDE WHICH COMPRISES PROVIDED WITH AN INTERNAL PRISES A SANDWICH OF LAYERED METALS, SUCCESSIVE LAYERS BEING NICKEL, IRON AND ALUMINUM, SAID ALUMINUM LAYER BEING LESS THAN 15 MICRONS AND MAINTAINING SAID SANDWICH IN A NON-OXIDIZING ATMOSPHERE AT A TEMPERATURE OF AT LEAST 700*C FOR A MAXIMUM OF 15 MINUTES.
Claim 2
Dependent Claim
68 words
METHOD OF MANUFACTRUING A GAS OR VAPOUR DISCHARGE TUBE IN WHICH THE DISCHARGE TUBE IS PROVIDED WITH AN INTERNAL ELECTRIDE WHICH COMPRISES PROVIDED WITH AN INTERNAL PRISES A SANDWICH OF LAYERED METALS, SUCCESSIVE LAYERS BEING NICKEL, IRON AND ALUMINUM, SAID ALUMINUM LAYER BEING LESS THAN 15 MICRONS AND MAINTAINING SAID SANDWICH IN A NON-OXIDIZING ATMOSPHERE AT A TEMPERATURE OF AT LEAST 700*C FOR A MAXIMUM OF 15 MINUTES.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, characterized in that the thermal treatment of said sandwich is effected after the step of positioning said electrode in the discharge tube.
Claim 4
Dependent Claim
54 words
A method as claimed in claim 2 further includes providing said nickel layer with an emitter which is provided on the nickel in the form of one or more carbonates converted into oxides during said maintaining step, said maintaining including maintaining said sandwich and emitter between 1000*C and 1100*C for 5 to 15 seconds.
Claim 5
Dependent Claim
29 words
A method as described in claim 3 wherein said providing step includes providing an aluminum layer of the electrode which has a work potential of more than 6 volts.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 4 for manufacturing a glow discharge lamp, said positioning step including positioning said nickel layer facing the light emergence side of the lamp.
Claim 7
Dependent Claim
34 words
A method as claimed in claim 4, for manufacturing an arc discharge lamp, wherein said providing step includes providing an electrode formed as a hollow electrode with its nickel layer on the inner side.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |