GB282539A - Improvements in and relating to the manufacture of cathodes for thermionic valves - Google Patents
Improvements in and relating to the manufacture of cathodes for thermionic valvesInfo
- Publication number
- GB282539A GB282539A GB2829726A GB2829726A GB282539A GB 282539 A GB282539 A GB 282539A GB 2829726 A GB2829726 A GB 2829726A GB 2829726 A GB2829726 A GB 2829726A GB 282539 A GB282539 A GB 282539A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- earth metal
- oxides
- mixture
- mixed
- 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
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
282,539. General Electric Co., Ltd., (Just, A.). Nov. 10, 1926. Vacuum tubes.-A thermionic cathode consists of a metallic core, for instance of tungsten, molybdenum, nickel, platinum or an alloy, permeated or coated with a mixture of oxides, the proportions of the oxides being about 1000: 1. The main constituent of the mixture may be an alkaline earth metal oxide, and the other constituent a small amount of the oxide of another alkaline earth metal, chromium or uranium or of a rare earth metal such as thorium, neodymium, praseodymium or samarium; or lanthanum oxide may be mixed with a small amount of an oxide of rare earth metal. Finely-divided molybdenum may be mixed with up to 3 per cent of the oxide mixture, and worked into wire by the usual methods. The oxides may be obtained from the corresponding azides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2829726A GB282539A (en) | 1926-11-10 | 1926-11-10 | Improvements in and relating to the manufacture of cathodes for thermionic valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2829726A GB282539A (en) | 1926-11-10 | 1926-11-10 | Improvements in and relating to the manufacture of cathodes for thermionic valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB282539A true GB282539A (en) | 1927-12-29 |
Family
ID=10273408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2829726A Expired GB282539A (en) | 1926-11-10 | 1926-11-10 | Improvements in and relating to the manufacture of cathodes for thermionic valves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB282539A (en) |
-
1926
- 1926-11-10 GB GB2829726A patent/GB282539A/en not_active Expired
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