GB269341A - Improvements in or relating to the manufacture of oxide cathodes for discharge tubes - Google Patents

Improvements in or relating to the manufacture of oxide cathodes for discharge tubes

Info

Publication number
GB269341A
GB269341A GB1139126A GB1139126A GB269341A GB 269341 A GB269341 A GB 269341A GB 1139126 A GB1139126 A GB 1139126A GB 1139126 A GB1139126 A GB 1139126A GB 269341 A GB269341 A GB 269341A
Authority
GB
United Kingdom
Prior art keywords
oxide
alloy
relating
manufacture
metal
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
GB1139126A
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
Priority to GB1139126A priority Critical patent/GB269341A/en
Priority to FR629228D priority patent/FR629228A/en
Publication of GB269341A publication Critical patent/GB269341A/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)
  • Discharge Lamp (AREA)

Abstract

269,341. Wade, H., (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). April 30, 1926. Vacuum tubes. - An electron-emitting oxide cathode is made by coating a highly refractory metal such as tungsten or molybdenum, which is preferably incapable of forming an alloy with alkaline earth metal with (a) a film of a highly refractory metal such as platinum which forms such an alloy, and the oxide of which has a, low vapour tension and (b) a film of a readily-oxidizable metal such as copper, which is preferably capable of forming the alloy and volatizes at a low temperature, partly or entirely oxidizing the surface, and applying (c) barium or other alkaline earth metal which is oxidized by interaction with copper &c. oxide.
GB1139126A 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes for discharge tubes Expired GB269341A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1139126A GB269341A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes for discharge tubes
FR629228D FR629228A (en) 1926-04-30 1927-02-17 Method for manufacturing oxide cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1139126A GB269341A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes for discharge tubes

Publications (1)

Publication Number Publication Date
GB269341A true GB269341A (en) 1927-04-21

Family

ID=9985353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1139126A Expired GB269341A (en) 1926-04-30 1926-04-30 Improvements in or relating to the manufacture of oxide cathodes for discharge tubes

Country Status (2)

Country Link
FR (1) FR629228A (en)
GB (1) GB269341A (en)

Also Published As

Publication number Publication date
FR629228A (en) 1927-11-07

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