GB1166927A - Improvements in or relating to the manufacture of electrodes - Google Patents
Improvements in or relating to the manufacture of electrodesInfo
- Publication number
- GB1166927A GB1166927A GB07360/67A GB1736067A GB1166927A GB 1166927 A GB1166927 A GB 1166927A GB 07360/67 A GB07360/67 A GB 07360/67A GB 1736067 A GB1736067 A GB 1736067A GB 1166927 A GB1166927 A GB 1166927A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- electrodes
- arc
- april
- coating
- 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)
- Discharge Lamp (AREA)
Abstract
1,166,927. Electrode materials and processing. CLAUDE. 14 April, 1967 [18 April, 1966], No. 17360/67. Heading H1D. A method of preparing an electrode which includes a portion having a surface containing thorium oxide, comprises heating the electrode in an atmosphere containing a hydrocarbon at a partial pressure of about 1 mm. Hg by passing an arc discharge between the electrode and a second electrode 16. The electrode comprises a thoriated W rod 4 on which one or two tungsten filaments 6 are wound, then covered with a coating 8 of powdered thoria, thorium, silica and a binder. The electrode is mounted in a glass bell 12 opposite the second electrode 16. The bell is purged with A then A containing naphthalene is introduced and an A.C. or D.C. arc initiated by contacting the electrodes. During the discharge the electrode is moved so that the cathode spot moves over all of the coating. The electrode is allowed to cool, arc heated and cooled in A. The surface may be surrounded with a metallic member formed with voids, slots or pores, e.g. a W helix. Two such electrodes and one or two auxiliary electrodes are mounted in a h.p. Hg vapour lamp containing A and Na, Th, In iodides. The lamp may be mounted in an evacuated envelope.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR57986A FR1489755A (en) | 1966-04-18 | 1966-04-18 | Process for the fuel treatment of a thorium oxide electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1166927A true GB1166927A (en) | 1969-10-15 |
Family
ID=8606469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB07360/67A Expired GB1166927A (en) | 1966-04-18 | 1967-04-14 | Improvements in or relating to the manufacture of electrodes |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3510190A (en) |
| BE (1) | BE693505A (en) |
| CH (1) | CH460186A (en) |
| FR (1) | FR1489755A (en) |
| GB (1) | GB1166927A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3846006A (en) * | 1972-02-24 | 1974-11-05 | Picker Corp | Method of manufacturing of x-ray tube having thoriated tungsten filament |
| US5001397A (en) * | 1985-07-17 | 1991-03-19 | U.S. Philips Corporation | High-pressure gas discharge lamp having electrodes with coil layers having interlocking turns |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1704981A (en) * | 1927-08-26 | 1929-03-12 | Lebrun Paul Francois Joseph | Method of preparing luminescent tubes |
| US2401040A (en) * | 1942-10-05 | 1946-05-28 | Eitel Mccullough Inc | Method of making electronic tubes |
| US2324559A (en) * | 1943-04-05 | 1943-07-20 | Machlett Lab Inc | Manufacture of vacuum apparatus |
| US2591474A (en) * | 1950-05-26 | 1952-04-01 | Raytheon Mfg Co | Cold cathode discharge device |
-
1966
- 1966-04-18 FR FR57986A patent/FR1489755A/en not_active Expired
-
1967
- 1967-01-30 US US612506A patent/US3510190A/en not_active Expired - Lifetime
- 1967-02-01 BE BE693505D patent/BE693505A/xx not_active IP Right Cessation
- 1967-04-06 CH CH486267A patent/CH460186A/en unknown
- 1967-04-14 GB GB07360/67A patent/GB1166927A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1489755A (en) | 1967-07-28 |
| BE693505A (en) | 1967-08-01 |
| DE1589111A1 (en) | 1970-03-19 |
| DE1589111B2 (en) | 1975-10-30 |
| US3510190A (en) | 1970-05-05 |
| CH460186A (en) | 1968-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE | Patent expired |