GB245145A - Improvements in oxide cathodes for discharge tubes and in processes for manufacturing same - Google Patents

Improvements in oxide cathodes for discharge tubes and in processes for manufacturing same

Info

Publication number
GB245145A
GB245145A GB32458/25A GB3245825A GB245145A GB 245145 A GB245145 A GB 245145A GB 32458/25 A GB32458/25 A GB 32458/25A GB 3245825 A GB3245825 A GB 3245825A GB 245145 A GB245145 A GB 245145A
Authority
GB
United Kingdom
Prior art keywords
azide
wire
heating
metal
temperature
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
GB32458/25A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB245145A publication Critical patent/GB245145A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

245,145. Naamlooze Vennootschap Philips' Gloeilampenfabrieken. Dec. 24, 1924, [Convention date]. Drawings to Specification. Vacuum tubes; R÷ntgen-ray tubes.-A coating of alkaline earth metal oxide is formed on a cathode by oxidizing wholly or partly the surface of a core of base metal, coating the oxidized surface with an azide of one or more alkaline earth metals, heating to decompose the azide, and heating subsequently in an atmosphere containing oxygen to oxidize the reduced metal wholly or partly. In the preferred process a solution of barium azide or a mixture of azides is trickled or squirted on to a nickel wire which is heated electrically to dry the azide. The prepared wire is mounted in a bulb which is then exhausted, and the wire heated electrically at 180-250‹ C. to decompose the azide. Oxygen or air is admitted and the temperature of the wire raised to 500‹ C. to oxidize the layer of metal, and the bulb is evacuated; a gas filling may be admitted subsequently. The cathode may be aged by gradually heating it to a high temperature and maintaining it at that temperature. In a modified process the wire is dipped in a solution of azide. Specifications 209,730, 214,262, and 229,622 are referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of a core of nickel. This subject-matter does not appear in the Specification as accepted.
GB32458/25A 1924-12-24 1925-12-23 Improvements in oxide cathodes for discharge tubes and in processes for manufacturing same Expired GB245145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL245145X 1924-12-24

Publications (1)

Publication Number Publication Date
GB245145A true GB245145A (en) 1926-07-08

Family

ID=19780799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32458/25A Expired GB245145A (en) 1924-12-24 1925-12-23 Improvements in oxide cathodes for discharge tubes and in processes for manufacturing same

Country Status (3)

Country Link
FR (1) FR605904A (en)
GB (1) GB245145A (en)
NL (1) NL18252C (en)

Also Published As

Publication number Publication date
NL18252C (en)
FR605904A (en) 1926-06-04

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