GB806032A - A process for the production of a hot cathode for thermionic tubes - Google Patents
A process for the production of a hot cathode for thermionic tubesInfo
- Publication number
- GB806032A GB806032A GB25744/55A GB2574455A GB806032A GB 806032 A GB806032 A GB 806032A GB 25744/55 A GB25744/55 A GB 25744/55A GB 2574455 A GB2574455 A GB 2574455A GB 806032 A GB806032 A GB 806032A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- oxide
- per cent
- point
- sept
- 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
806,032. Cathode materials and processing. PATELHOLD PATENTVERWERTUNGS- & ELECTRO-HOLDING A.G. Sept. 8, 1955 [Sept. 8, 1954], No. 25744/55. Class 39(1). A thermionic cathode comprising an alkaline earth metal compound on a metal carrier is processed by being heated, a portion at a time, to at least 3500‹C. The carrier may be nickel, and the compound a mixture of the usual oxides, e.g. 40-100 per cent. barium oxide, 0-60 per cent. strontium oxide, and 0-15 per cent calcium oxide. The process may be carried out by making the cathode one electrode of an electric arc, preferably struck in a low-pressure atmosphere of inert gas. The focal spot of the arc jumps about from point to point over the cathode surface, heating each point momentarily to the required temperature. The finished cathode operates at 800‹C. It is substantially free of oxide, and may therefore be stored in air without contamination.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH806032X | 1954-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB806032A true GB806032A (en) | 1958-12-17 |
Family
ID=4538064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25744/55A Expired GB806032A (en) | 1954-09-08 | 1955-09-08 | A process for the production of a hot cathode for thermionic tubes |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH323755A (en) |
| DE (1) | DE1014235B (en) |
| FR (1) | FR1131224A (en) |
| GB (1) | GB806032A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0082965A2 (en) * | 1981-12-24 | 1983-07-06 | International Standard Electric Corporation | Method of forming thermionic cathodes |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE443323C (en) * | 1923-01-12 | 1927-04-26 | Philips Nv | Process for the manufacture of oxide cathodes |
| US2543439A (en) * | 1945-05-02 | 1951-02-27 | Edward A Coomes | Method of manufacturing coated elements for electron tubes |
-
1954
- 1954-09-08 CH CH323755D patent/CH323755A/en unknown
- 1954-09-22 DE DEP12747A patent/DE1014235B/en active Pending
-
1955
- 1955-09-07 FR FR1131224D patent/FR1131224A/en not_active Expired
- 1955-09-08 GB GB25744/55A patent/GB806032A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0082965A2 (en) * | 1981-12-24 | 1983-07-06 | International Standard Electric Corporation | Method of forming thermionic cathodes |
| EP0082965A3 (en) * | 1981-12-24 | 1984-09-05 | International Standard Electric Corporation | Method of forming thermionic cathodes |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1131224A (en) | 1957-02-19 |
| CH323755A (en) | 1957-08-15 |
| DE1014235B (en) | 1957-08-22 |
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