GB439234A - Improvements in and relating to electric discharge devices - Google Patents
Improvements in and relating to electric discharge devicesInfo
- Publication number
- GB439234A GB439234A GB634034A GB634034A GB439234A GB 439234 A GB439234 A GB 439234A GB 634034 A GB634034 A GB 634034A GB 634034 A GB634034 A GB 634034A GB 439234 A GB439234 A GB 439234A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- compound
- metal
- refractory metal
- barium
- 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
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
439,234. Thermionic cathodes. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Allgemeine Elektricitõts-Ges.; 2, Friedrich Karl Ufer, Berlin) Feb. 27, 1934, No. 6340. Void [Abridged as open to inspection under Sect. 91 of the Acts, Aug. 29, 1934]. [Class 39 (i)] A method of making a cathode consists in starting with a compound of a refractory metal and an alkaline or rare earth metal and treating the compound in a reducing atmosphere to reduce it to the refractory metal and an oxide of the alkaline or rare earth metal. The compound may be barium tungstate, molybdate or rhenate, or bariumnickel cyanite or other barium-nickel double salt. It is placed upon a foundation metal, tungsten, molybdenum, rhenium or nickel respectively, reduced in a stream of hydrogen and sintered. Or a mixture of materials, e.g. 90 per cent barium tungstate and 10 per cent calcium tungstate may be used. Kaolin or aluminium oxide may be added if desired. In another example, thorium and cerium tungstates are used in such proportion that the resulting thorium oxide and cerium oxide are in the ratio 99.1 to 0.09. If filaments are made of the material powdered refractory metal may be added to increase the conductivity
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB634034A GB439234A (en) | 1934-02-27 | 1934-02-27 | Improvements in and relating to electric discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB634034A GB439234A (en) | 1934-02-27 | 1934-02-27 | Improvements in and relating to electric discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB439234A true GB439234A (en) | 1935-12-02 |
Family
ID=9812702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB634034A Expired GB439234A (en) | 1934-02-27 | 1934-02-27 | Improvements in and relating to electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB439234A (en) |
-
1934
- 1934-02-27 GB GB634034A patent/GB439234A/en not_active Expired
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