GB391750A - Improvements in and relating to thermionic cathodes - Google Patents

Improvements in and relating to thermionic cathodes

Info

Publication number
GB391750A
GB391750A GB21406/31A GB2140631A GB391750A GB 391750 A GB391750 A GB 391750A GB 21406/31 A GB21406/31 A GB 21406/31A GB 2140631 A GB2140631 A GB 2140631A GB 391750 A GB391750 A GB 391750A
Authority
GB
United Kingdom
Prior art keywords
cathode
july
class
hydrogen
gas
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
GB21406/31A
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 GB391750A publication Critical patent/GB391750A/en
Expired legal-status Critical Current

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
    • H01J9/045—Activation of assembled cathode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/929—Electrical contact feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/938—Vapor deposition or gas diffusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

391,750. Thermionic cathodes. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Fonda, G. R. ; 1028, Parkwood Boulevard, Schenectady, New York, U.S.A.) July 27, 1931, No. 21406. Convention date, July 29, 1930. Void [Published under Sect. 91 of the Acts]. [Class 39 (i).] A thoriated tungsten or other cathode of the adsorbed film type is activated by incandescing in the presence of a gas, such as hydrogen, argon or nitrogen. The cathode may be flashed at 3000‹ K. for one minute in hydrogen at atmospheric pressure. It is stated that the grain structure of the foundation metal is coarsened by flashing in gas, thereby reducing the rate of diffusion of the high emission material to the surface. The cathode may be carburized subsequently by heating in the vapour of benzol or similar hydrocarbon. Specifications 148,132, 184,446, and 218,630, fall in Class 39 (i), Electric lamps, Arc &c], are referred to.
GB21406/31A 1930-07-29 1931-07-27 Improvements in and relating to thermionic cathodes Expired GB391750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US471599A US2069407A (en) 1930-07-29 1930-07-29 Thermionic cathode and process of activation

Publications (1)

Publication Number Publication Date
GB391750A true GB391750A (en) 1933-05-04

Family

ID=23872258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21406/31A Expired GB391750A (en) 1930-07-29 1931-07-27 Improvements in and relating to thermionic cathodes

Country Status (4)

Country Link
US (1) US2069407A (en)
DE (1) DE611335C (en)
FR (1) FR721467A (en)
GB (1) GB391750A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE461800A (en) * 1942-11-23
US2688707A (en) * 1948-02-28 1954-09-07 Eitel Mccullough Inc Electron tube structure
US3275398A (en) * 1960-04-28 1966-09-27 Westinghouse Electric Corp Apparatus for heat treating lamp filaments

Also Published As

Publication number Publication date
DE611335C (en) 1935-03-26
FR721467A (en) 1932-03-03
US2069407A (en) 1937-02-02

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