GB487257A - Improvements in thermionic valves with filamentary cathodes - Google Patents
Improvements in thermionic valves with filamentary cathodesInfo
- Publication number
- GB487257A GB487257A GB306437A GB306437A GB487257A GB 487257 A GB487257 A GB 487257A GB 306437 A GB306437 A GB 306437A GB 306437 A GB306437 A GB 306437A GB 487257 A GB487257 A GB 487257A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- thermionic valves
- filamentary
- class
- oxide
- 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
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
- H01J2893/0002—Construction arrangements of electrode systems
Landscapes
- Discharge Lamp (AREA)
Abstract
487,257. Thermionic valves. M-O VALVE CO., Ltd., and SMITHELLS, C. J. Feb. 2, 1937, No. 3064. [Class 39 (i)] In thermionic valves having a filamentary cathode adapted to operate at a temperature not exceeding 1500‹ C., e.g. an oxide-coated filament, the filament is supported substantially along the whole of its active length by a plate of insulating material on one side of which it rests and which carries on the same side at least one of the electrodes with which it co-operates. As shown a helical filamentary oxide-coated cathode 9 lies between ridges on a steatite plate 2 supported in an approximately cylindrical bulb 1 by the leading in wires 3, 4, 5, 6 passing through a ring seal 7. The grid 10 and anode 11 are both cylindrical and are fixed by tags entering holes in the plate 1. Specification 290,355, [Class 39 (i)], is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB306437A GB487257A (en) | 1937-02-02 | 1937-02-02 | Improvements in thermionic valves with filamentary cathodes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB306437A GB487257A (en) | 1937-02-02 | 1937-02-02 | Improvements in thermionic valves with filamentary cathodes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB487257A true GB487257A (en) | 1938-06-17 |
Family
ID=9751302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB306437A Expired GB487257A (en) | 1937-02-02 | 1937-02-02 | Improvements in thermionic valves with filamentary cathodes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB487257A (en) |
-
1937
- 1937-02-02 GB GB306437A patent/GB487257A/en not_active Expired
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