GB285538A - Improvements in or relating to vacuum electric tube devices - Google Patents
Improvements in or relating to vacuum electric tube devicesInfo
- Publication number
- GB285538A GB285538A GB2819126A GB2819126A GB285538A GB 285538 A GB285538 A GB 285538A GB 2819126 A GB2819126 A GB 2819126A GB 2819126 A GB2819126 A GB 2819126A GB 285538 A GB285538 A GB 285538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- oxide
- coating
- sheath
- framework
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Chemical Vapour Deposition (AREA)
- Discharge Lamp (AREA)
Abstract
285,538. Robinson, E. Y., and Metropolitan-Vickers Electrical Co., Ltd. Nov. 9, 1926. Vacuum tubes.-Filament cathodes are, coated with oxide, or with one or more substances subsequently converted to oxides, after mounting the filament on its supports but before the other electrodes are associated with the pinch or seal or, if such is used, with a cathode framework such as is described in Specifications 285,536 and 285,537. A fine filament with a sheath of another metal applied, for example, by the Wollaston process may have the sheath removed, after mounting the filament on its supports or framework, by evaporation or solution : a silver sheath on a platinum-iridium filament may be dissolved in dilute nitric acid or removed by heating in a vacuum oven or by passing current through the filament in a vacuum. After removal of the sheath, a coating of oxide, carbonate or alkaline earth metal is applied, the metal being converted to oxide before or after mounting the framework on the foot or after sealing the electrodes into the envelope. Oxide coatings may be converted to carbonates before inserting into the valve. The electrolytic process described in Specification 221,851 may be used, a coating of metal or, if water is added to the electrolyte, of oxide being formed. The framework may be protected during coating by paraffin wax. The coating may alternatively be applied by repeated dipping in an aqueous solution of barium and strontium nitrate, the filament being heated by current in carbon dioxide after each dipping to form carbonates. In further modifications, coatings of a suspension or paint of barium or strontium carbonates in water or alcohol are applied and heated in carbon dioxide. Specifications 245,146, 245,147, 272,549, and 275,542 also are referred to. The Provisional Specification describes the removal of a thin metallic sheath after the oxide coating is applied, also coatings sprayed on to the filament.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2819126A GB285538A (en) | 1926-11-09 | 1926-11-09 | Improvements in or relating to vacuum electric tube devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2819126A GB285538A (en) | 1926-11-09 | 1926-11-09 | Improvements in or relating to vacuum electric tube devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB285538A true GB285538A (en) | 1928-02-09 |
Family
ID=10271722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2819126A Expired GB285538A (en) | 1926-11-09 | 1926-11-09 | Improvements in or relating to vacuum electric tube devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB285538A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE748240C (en) * | 1937-08-30 | 1944-10-30 | Process for the production of glow cathodes for electric discharge tubes |
-
1926
- 1926-11-09 GB GB2819126A patent/GB285538A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE748240C (en) * | 1937-08-30 | 1944-10-30 | Process for the production of glow cathodes for electric discharge tubes |
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