GB499171A - Improvements in electric discharge tubes - Google Patents
Improvements in electric discharge tubesInfo
- Publication number
- GB499171A GB499171A GB11116/38A GB1111638A GB499171A GB 499171 A GB499171 A GB 499171A GB 11116/38 A GB11116/38 A GB 11116/38A GB 1111638 A GB1111638 A GB 1111638A GB 499171 A GB499171 A GB 499171A
- Authority
- GB
- United Kingdom
- Prior art keywords
- volts
- electrode
- beryllium
- april
- electric discharge
- 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
Landscapes
- Gas-Filled Discharge Tubes (AREA)
Abstract
499,171. Electrode materials. NAAMLOOZE VENNOOTSCHAP PHILIPS'GLOEILAMPENFABRIEKEN. April 11, 1938, No. 11116. Convention date, April 13, 1937. [Class 39 (i)] In order to minimize secondary emission the electrode of a discharge tube is coated with pure metallic lithium and beryllium or both. It is stated that these elements have a secondary emission whose maximum is low and occurs at a potential difference between the primary and secondary emitting electrodes of 200 volts in the case of beryllium and 100 volts for lithium. The invention is therefore particularly applicable to cathode ray and like tubes in which the potentials are greater than 200 volts. The metal is deposited from a vapour by heating or cathodic disintegration of another electrode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL499171X | 1937-04-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB499171A true GB499171A (en) | 1939-01-19 |
Family
ID=19786762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11116/38A Expired GB499171A (en) | 1937-04-13 | 1938-04-11 | Improvements in electric discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB499171A (en) |
-
1938
- 1938-04-11 GB GB11116/38A patent/GB499171A/en not_active Expired
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