GB274233A - Improvements in or relating to the manufacture of oxide cathodes - Google Patents

Improvements in or relating to the manufacture of oxide cathodes

Info

Publication number
GB274233A
GB274233A GB1146326A GB1146326A GB274233A GB 274233 A GB274233 A GB 274233A GB 1146326 A GB1146326 A GB 1146326A GB 1146326 A GB1146326 A GB 1146326A GB 274233 A GB274233 A GB 274233A
Authority
GB
United Kingdom
Prior art keywords
alkaline earth
earth metals
copper
oxidizing
alloy
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
GB1146326A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1146326A priority Critical patent/GB274233A/en
Publication of GB274233A publication Critical patent/GB274233A/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)
  • Solid Thermionic Cathode (AREA)

Abstract

274,233. Wade, H., (Naamlooze Vennoots. chap Philips' Gloeilampenfabrieken). April 30, 1926. Vacuum tubes.-Oxide cathodes are made by coating a core of tungsten or molybdenum or other highly refractory metal or alloy not forming an alloy with alkaline earth metals with a film of copper or other readily oxidized metal of comparatively low volatilizing temperature, oxidizing the film partially or wholly bringing it into contact with one or more alkaline earth metals, for example, barium condensed from barium vapour, oxidizing the alkaline earth metals by heating, the oxygen being supplied by the oxide of copper &c. with or without supplementary oxygen or air, and finally heating to such a temperature that the reduced copper or like metal evaporates.
GB1146326A 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes Expired GB274233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1146326A GB274233A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1146326A GB274233A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes

Publications (1)

Publication Number Publication Date
GB274233A true GB274233A (en) 1927-07-21

Family

ID=9986707

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1146326A Expired GB274233A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes

Country Status (1)

Country Link
GB (1) GB274233A (en)

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