GB446478A - Improvements in and relating to cathodes for electric discharge devices - Google Patents

Improvements in and relating to cathodes for electric discharge devices

Info

Publication number
GB446478A
GB446478A GB32182/35A GB3218235A GB446478A GB 446478 A GB446478 A GB 446478A GB 32182/35 A GB32182/35 A GB 32182/35A GB 3218235 A GB3218235 A GB 3218235A GB 446478 A GB446478 A GB 446478A
Authority
GB
United Kingdom
Prior art keywords
oxide
nov
cathode
cover
cathodes
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
GB32182/35A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB446478A publication Critical patent/GB446478A/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

Landscapes

  • Discharge Lamp (AREA)

Abstract

446,478. Thermionic cathodes. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London. Nov. 20, 1935, No. 32182. Convention date, Nov. 20, 1934. [Class 39 (i)] A cathode for use in valves, gas-filled lamps or rectifiers comprises a mass of barium oxide 51 wholly enclosed in a cover consisting of metal washers or helically-wound ribbon 48 held together by rods 49 and refractory end plates 50 ; the oxide forms an emitting film on the cover by migration through the crevices between the washers &c. The oxide may be granular or a compact mass, and nickel or tungsten may be mixed therewith to reduce the oxide during the life of the cathode. A heat shield consisting of an open-ended cylinder with slits in its wall may be used. The filling may be argon, neon, mercury sodium or caesium or a mixture of these materials at a pressure of one micron upwards. Speci- , fication 395,794 is referred to.
GB32182/35A 1934-11-20 1935-11-20 Improvements in and relating to cathodes for electric discharge devices Expired GB446478A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US446478XA 1934-11-20 1934-11-20

Publications (1)

Publication Number Publication Date
GB446478A true GB446478A (en) 1936-04-30

Family

ID=21933527

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32182/35A Expired GB446478A (en) 1934-11-20 1935-11-20 Improvements in and relating to cathodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB446478A (en)

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