GB641796A - Improvements in or relating to cathodes for ultra-high-frequency discharge tubes - Google Patents
Improvements in or relating to cathodes for ultra-high-frequency discharge tubesInfo
- Publication number
- GB641796A GB641796A GB10106/47A GB1010647A GB641796A GB 641796 A GB641796 A GB 641796A GB 10106/47 A GB10106/47 A GB 10106/47A GB 1010647 A GB1010647 A GB 1010647A GB 641796 A GB641796 A GB 641796A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- convert
- oxides
- tube
- ultra
- 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)
- Discharge Lamp (AREA)
Abstract
641,796. Cathode materials and processing. PHILIPS LAMPS, Ltd. April 16, 1947, No. 10106. Convention date, Dec. 12, 1944. [Class 39 (i)] A cathode for an ultra-high-frequency tube has a thin emissive layer formed by precipitation of one or more alkaline earth metals from the vapour phase and subsequent oxidation. The layer is not more than 10 Á thick and preferably less than 5Á, and the vapour may be obtained by heating one or more azides, one or more alloys, or a mixture of one or more oxides with a reducing agent such as magnesium or zirconium. A mixture of barium and strontium azides may be used in such proportions that the resulting oxides are in a ratio between 1:1 and 4: 1. This may be precipitated on a core of metal provided with a thin layer of copper superficially oxidized. The cathode is then heated to convert the precipitated metal into oxides. The cathode may be formed outside the tube in which it is to be used, subjected to an atmosphere containing CO 2 to convert the oxide into carbonate, mounted in the tube and heated to convert the carbonate into oxide. Specifications 229,622 and 637,385 are referred to. Reference has been directed by the Comptroller to Specification 637,385.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE641796X | 1944-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB641796A true GB641796A (en) | 1950-08-23 |
Family
ID=3876417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10106/47A Expired GB641796A (en) | 1944-12-12 | 1947-04-16 | Improvements in or relating to cathodes for ultra-high-frequency discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB641796A (en) |
-
1947
- 1947-04-16 GB GB10106/47A patent/GB641796A/en not_active Expired
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