GB714429A - Improvements in or relating to thermionic cathodes - Google Patents
Improvements in or relating to thermionic cathodesInfo
- Publication number
- GB714429A GB714429A GB1684051A GB1684051A GB714429A GB 714429 A GB714429 A GB 714429A GB 1684051 A GB1684051 A GB 1684051A GB 1684051 A GB1684051 A GB 1684051A GB 714429 A GB714429 A GB 714429A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkaline earth
- mixed
- july
- cathode
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
- H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
Landscapes
- Discharge Lamp (AREA)
Abstract
714,429. Electrode materials and processing. GENERAL ELECTRIC CO., Ltd., BOWTELL, J. N., MILES, E. E., ROOKSBY, H. P., and STEWARD, E. G. July 10, 1952 [July 16, 1951; July 25, 1951], Nos. 16840/51 and 17631/51. Class 39(1) A thermionic cathode for a gas or vapour discharge tube has electron emissive material which consists wholly or mainly of a mixture of one or more alkaline earth oxides with one or more alkaline earth tungstates of the formula X 3 WO 6 where X is one or more of the alkaline earth metals. The tungstate may be mixed with the alkaline earth oxide or powdered tungsten or tungsten oxide of grain size ¢ to 5 microns is mixed with alkaline earth compounds, e.g. carbonates, and heated to 1300‹C during the processing of the tube. Barium or strontium oxides separately or mixed is preferred; not more than 10 per cent of calcium oxide may be used. The material mixed with gum tragacanth is shaped into pellets for enclosure within the cathode or a suspension thereof may be dipped, painted or sprayed on to the cathode, e.g. a coiled coil filament for a fluorescent discharge lamp.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1684051A GB714429A (en) | 1951-07-16 | 1951-07-16 | Improvements in or relating to thermionic cathodes |
FR1060976D FR1060976A (en) | 1951-07-16 | 1952-07-16 | Thermionic cathode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1684051A GB714429A (en) | 1951-07-16 | 1951-07-16 | Improvements in or relating to thermionic cathodes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB714429A true GB714429A (en) | 1954-08-25 |
Family
ID=10084624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1684051A Expired GB714429A (en) | 1951-07-16 | 1951-07-16 | Improvements in or relating to thermionic cathodes |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1060976A (en) |
GB (1) | GB714429A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1057231B (en) * | 1956-03-03 | 1959-05-14 | Patra Patent Treuhand | Activated glow electrode for electric discharge lamps |
DE1183172B (en) * | 1961-01-26 | 1964-12-10 | Philips Nv | Low pressure discharge lamp |
FR2438338A1 (en) * | 1978-10-06 | 1980-04-30 | Philips Nv | HIGH PRESSURE SODIUM STEAM DISCHARGE LAMP |
-
1951
- 1951-07-16 GB GB1684051A patent/GB714429A/en not_active Expired
-
1952
- 1952-07-16 FR FR1060976D patent/FR1060976A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1057231B (en) * | 1956-03-03 | 1959-05-14 | Patra Patent Treuhand | Activated glow electrode for electric discharge lamps |
DE1183172B (en) * | 1961-01-26 | 1964-12-10 | Philips Nv | Low pressure discharge lamp |
FR2438338A1 (en) * | 1978-10-06 | 1980-04-30 | Philips Nv | HIGH PRESSURE SODIUM STEAM DISCHARGE LAMP |
US4322654A (en) * | 1978-10-06 | 1982-03-30 | U.S. Philips Corporation | High-pressure sodium vapor discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
FR1060976A (en) | 1954-04-07 |
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