GB637385A - Improved process of manufacturing cathodes for electric discharge tubes - Google Patents
Improved process of manufacturing cathodes for electric discharge tubesInfo
- Publication number
- GB637385A GB637385A GB11592/47A GB1159247A GB637385A GB 637385 A GB637385 A GB 637385A GB 11592/47 A GB11592/47 A GB 11592/47A GB 1159247 A GB1159247 A GB 1159247A GB 637385 A GB637385 A GB 637385A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- heating
- metal
- electric discharge
- improved process
- 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)
- Solid Thermionic Cathode (AREA)
Abstract
637,385. Cathode materials and processing. PHILIPS LAMPS, Ltd. April 30, 1947, No. 11592. Convention date, Nov. 4, 1944. [Class 39 (i)] A process for manufacturing a cathode consists in heating a mixture, compound or alloy, containing an alkaline earth metal in an evacuated container to vaporize the metal on to a cathode core of nickel, copper or other oxidized metal ; heating the core until the alkali metal is oxidized ; subjecting the cathode to prolonged exposure to an atmosphere, such as air, which contains carbon dioxide so that the oxide is converted into carbonate ; mounting the cathode in a discharge tube ; heating the cathode to reconvert the carbonate into oxide ; and de-gassing the tube. In this way an emissive layer of thickness between 0.1 and 1 micron may be produced. The exposure to air should preferably be for at least 48 hours.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE258432X | 1944-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB637385A true GB637385A (en) | 1950-05-17 |
Family
ID=3866699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11592/47A Expired GB637385A (en) | 1944-11-04 | 1947-04-30 | Improved process of manufacturing cathodes for electric discharge tubes |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE457759A (en) |
| CH (1) | CH258432A (en) |
| DE (1) | DE819296C (en) |
| FR (1) | FR936338A (en) |
| GB (1) | GB637385A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1052578B (en) * | 1953-06-18 | 1959-03-12 | Siemens Ag | Process for the production of an oxide cathode with a porous metal layer sintered onto the surface of the cathode body |
-
0
- BE BE457759D patent/BE457759A/xx unknown
-
1946
- 1946-09-07 CH CH258432D patent/CH258432A/en unknown
- 1946-11-27 FR FR936338D patent/FR936338A/en not_active Expired
-
1947
- 1947-04-30 GB GB11592/47A patent/GB637385A/en not_active Expired
-
1948
- 1948-10-26 DE DEP19566A patent/DE819296C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE819296C (en) | 1951-10-31 |
| FR936338A (en) | 1948-07-16 |
| CH258432A (en) | 1948-11-30 |
| BE457759A (en) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2390701A (en) | Secondary electron emitter | |
| GB637385A (en) | Improved process of manufacturing cathodes for electric discharge tubes | |
| GB496556A (en) | Improvements in electrodes for electron discharge devices | |
| US2840751A (en) | Electrode coating composition and electrode for cold cathode gas discharge lamp | |
| US2306290A (en) | Cathode alloy | |
| US2206372A (en) | Method of manufacturing secondary emitting electrodes | |
| US1747063A (en) | Electrode composition for electron-discharge devices | |
| US2879420A (en) | Image orthicon target | |
| GB642755A (en) | Improvements in or relating to the manufacture of oxide cathodes for electric discharge tubes | |
| GB449230A (en) | Improvements in or relating to electrodes having photo-electric emission properties | |
| US2066081A (en) | Phototube | |
| US2586771A (en) | Process for making secondary emission electrodes | |
| GB219663A (en) | Improvements in electrodes for discharge tubes | |
| US1894946A (en) | Method for activating glowing cathodes or the like | |
| US1759454A (en) | Uranium metal and product and process of making the same | |
| GB641796A (en) | Improvements in or relating to cathodes for ultra-high-frequency discharge tubes | |
| US2639963A (en) | Secondary emitter and method of manufacture | |
| US1758710A (en) | Electron-discharge device | |
| GB487699A (en) | Improvements in thermionic cathodes for use in electric discharge tubes | |
| GB492025A (en) | Improved method of manufacturing secondary-emission electrodes | |
| US1747061A (en) | Electrode composition for electron-discharge devices | |
| Mullard | Wireless Section: Chairman's address.“The development of the receiving valve” | |
| US2434517A (en) | Method of activating cathodes | |
| US2463727A (en) | Process of manufacturing cathodes for electric discharge tubes | |
| US1972647A (en) | Electric glow discharge tube |