GB307099A - Improvements in the manufacture of electron-emitting bodies - Google Patents

Improvements in the manufacture of electron-emitting bodies

Info

Publication number
GB307099A
GB307099A GB32420/27A GB3242027A GB307099A GB 307099 A GB307099 A GB 307099A GB 32420/27 A GB32420/27 A GB 32420/27A GB 3242027 A GB3242027 A GB 3242027A GB 307099 A GB307099 A GB 307099A
Authority
GB
United Kingdom
Prior art keywords
alkaline
core
vacuum
metal
electron
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
GB32420/27A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB32420/27A priority Critical patent/GB307099A/en
Priority to US322971A priority patent/US1836990A/en
Publication of GB307099A publication Critical patent/GB307099A/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
    • H01J9/047—Cathodes having impregnated bodies
    • 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

Abstract

307,099. Robinson, E. Y., and Metropolitan-Vickers Electrical Co., Ltd. Dec. 1, 1927. Vacuum tubes. - Electron-emitting cathodes are manufactured before insertion into a vacuum tube by associating a nickel, platinum, or like core with an alkaline-earth metal or amalgam or compound thereof which when heated will deposit the metal, and heating in a vacuum or in an inert or reducing atmosphere to effect the impregnation of the core by the alkaline-earth metal. The core may be wound on a frame, cleaned and decarbonized if necessary, and the spool then placed in a vessel packed with the alkaline-earth material in chip, filings, or powder form, and heated. The impregnated filament is mounted in a vacuum tube and activated by heat in the presence of magnesium, barium, or misch metal vapour. It may be flashed at high temperatures for a few seconds before the ageing operation. If desired, the filament may be oxidized in the valve before the gettering operation. Specification 221,851, which describes the manufacture of oxide-coated filaments, is referred to.
GB32420/27A 1927-12-01 1927-12-01 Improvements in the manufacture of electron-emitting bodies Expired GB307099A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB32420/27A GB307099A (en) 1927-12-01 1927-12-01 Improvements in the manufacture of electron-emitting bodies
US322971A US1836990A (en) 1927-12-01 1928-11-30 Manufacture of electron-emitting bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32420/27A GB307099A (en) 1927-12-01 1927-12-01 Improvements in the manufacture of electron-emitting bodies

Publications (1)

Publication Number Publication Date
GB307099A true GB307099A (en) 1929-03-01

Family

ID=10338317

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32420/27A Expired GB307099A (en) 1927-12-01 1927-12-01 Improvements in the manufacture of electron-emitting bodies

Country Status (2)

Country Link
US (1) US1836990A (en)
GB (1) GB307099A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3467467D1 (en) * 1983-09-30 1987-12-17 Bbc Brown Boveri & Cie Thermionic cathode capable of high emission for an electron tube, and method of manufacture

Also Published As

Publication number Publication date
US1836990A (en) 1931-12-15

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