GB289762A - An improved process for the manufacture of cathodes for electric discharge tubes - Google Patents
An improved process for the manufacture of cathodes for electric discharge tubesInfo
- Publication number
- GB289762A GB289762A GB13022/27A GB1302227A GB289762A GB 289762 A GB289762 A GB 289762A GB 13022/27 A GB13022/27 A GB 13022/27A GB 1302227 A GB1302227 A GB 1302227A GB 289762 A GB289762 A GB 289762A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alloy
- cathode
- alkaline earth
- tubes
- metals
- 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)
- Electrolytic Production Of Metals (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
289,762. Vereinigte Gl³hlampen-und Elektricitõts Akt.-Ges. April 30, 1927, [Convention date]. Vacuum tubes; R÷ntgen-ray tubes.-Cathodes for discharge tubes such as radio valves, rectifiers and R÷ntgen-ray tubes are coated with alkaline earth metals or their oxides by introducing into the tube an alloy of the alkaline earth metal not oxidizing in air, decomposing the alloy in vacuo and vaporizing it partially or completely to form a thin deposit on the core wire of the cathode. The alkaline earth metal may be alloyed with an electropositive metal vaporizing at not too high a temperature. Bariummagnesium alloy may be attached to the anode near to, and on the side facing, the cathode and the anode heated by high-frequency induction to melt and decompose the alloy and to vaporize the barium or both metals. The vaporized metals produce and maintain a high vacuum. The barium deposit on the cathode is free from oxide and firmly adherent and may be partially oxidized subsequently.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT289762X | 1927-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB289762A true GB289762A (en) | 1929-01-03 |
Family
ID=3670921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13022/27A Expired GB289762A (en) | 1927-04-30 | 1927-11-18 | An improved process for the manufacture of cathodes for electric discharge tubes |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE348355A (en) |
| DE (1) | DE593719C (en) |
| GB (1) | GB289762A (en) |
-
0
- BE BE348355D patent/BE348355A/xx unknown
-
1927
- 1927-05-18 DE DEV22543D patent/DE593719C/en not_active Expired
- 1927-11-18 GB GB13022/27A patent/GB289762A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE593719C (en) | 1934-03-05 |
| BE348355A (en) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US1862138A (en) | Carbonized electrode and method of producing same | |
| US2497090A (en) | Electrode and method of making the same | |
| US2566115A (en) | Alloy for cathode element | |
| GB289762A (en) | An improved process for the manufacture of cathodes for electric discharge tubes | |
| US2192491A (en) | Cathode for electron discharge devices | |
| US1926846A (en) | Electrode for electron discharge devices | |
| US1981620A (en) | Electrode for electron discharge devices | |
| US2171227A (en) | Secondary electron emitter and method of making it | |
| US2586768A (en) | Vacuum tube electrode element | |
| US1849594A (en) | Oxide cathode | |
| GB642755A (en) | Improvements in or relating to the manufacture of oxide cathodes for electric discharge tubes | |
| US2693431A (en) | Method of making electron emitters | |
| US2290913A (en) | Electric discharge tube | |
| US1830162A (en) | Cathode and process of making the same | |
| US2434517A (en) | Method of activating cathodes | |
| US2241565A (en) | Grid electrode | |
| GB236615A (en) | Improvements in cathodes for vacuum electric devices | |
| US1871352A (en) | Electron discharge device and method of manufacture | |
| GB514854A (en) | Improvements in or relating to electron discharge devices and to thermionic cathodes therefor | |
| GB289763A (en) | An improved method for the production of cathodes for electric discharge tubes | |
| Mullard | Wireless Section: Chairman's address.“The development of the receiving valve” | |
| GB337971A (en) | Method for the manufacture of filaments for electron discharge tubes | |
| GB271466A (en) | Improvements in or relating to rectifying discharge tubes | |
| GB404169A (en) | Thermionic cathode for electric discharge devices | |
| GB317504A (en) | Improvements in and relating to the manufacture of electric discharge devices |