GB451989A - Improvements in thermionic electrodes - Google Patents

Improvements in thermionic electrodes

Info

Publication number
GB451989A
GB451989A GB2077435A GB2077435A GB451989A GB 451989 A GB451989 A GB 451989A GB 2077435 A GB2077435 A GB 2077435A GB 2077435 A GB2077435 A GB 2077435A GB 451989 A GB451989 A GB 451989A
Authority
GB
United Kingdom
Prior art keywords
paste
cathode
helix
heating
tungsten
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
Application number
GB2077435A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to GB2077435A priority Critical patent/GB451989A/en
Priority to US87768A priority patent/US2175345A/en
Publication of GB451989A publication Critical patent/GB451989A/en
Expired legal-status Critical Current

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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Landscapes

  • Cold Cathode And The Manufacture (AREA)

Abstract

451,989. Thermionic cathodes. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Patent - Treuhand-Ges. fur Elektrische Gl³hlampen; 11, Ehrenbergstrasse, Berlin) July 22, 1935, No. 20774. [Class 39 (i)] A cathode is made by filling a tungsten helix 2 with a paste of material having high emissivity, and then heating the paste to convert it into a hard coherent mass. The paste is formed by sintering a mixture of alkali oxides or carbonates and tungsten powder and then grinding the mass thus produced to fine powder ; alcohol is used to form the paste 5 which is placed in the helix. Heating is in a neutral or reducing atmosphere at a temperature of at least 1700‹ C. Current is passed through the helix during the forming process after the cathode has been mounted in a lamp ; the cathode may be heated by the discharge or independently.
GB2077435A 1935-07-12 1935-07-22 Improvements in thermionic electrodes Expired GB451989A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2077435A GB451989A (en) 1935-07-22 1935-07-22 Improvements in thermionic electrodes
US87768A US2175345A (en) 1935-07-12 1936-06-27 Electric gaseous discharge device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2077435A GB451989A (en) 1935-07-22 1935-07-22 Improvements in thermionic electrodes

Publications (1)

Publication Number Publication Date
GB451989A true GB451989A (en) 1936-08-14

Family

ID=10151456

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2077435A Expired GB451989A (en) 1935-07-12 1935-07-22 Improvements in thermionic electrodes

Country Status (1)

Country Link
GB (1) GB451989A (en)

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