GB445948A - Improvements in or relating to electric discharge devices - Google Patents

Improvements in or relating to electric discharge devices

Info

Publication number
GB445948A
GB445948A GB31793/34A GB3179334A GB445948A GB 445948 A GB445948 A GB 445948A GB 31793/34 A GB31793/34 A GB 31793/34A GB 3179334 A GB3179334 A GB 3179334A GB 445948 A GB445948 A GB 445948A
Authority
GB
United Kingdom
Prior art keywords
relating
electric discharge
discharge devices
aluminium
cathode
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
GB31793/34A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB445948A publication Critical patent/GB445948A/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

A discharge-tube cathode is made by coating a metal of high electron-emissivity on a carrier of aluminium and then heating the carrier until the coating metal permeates and alloys with the aluminium. In one method, potassium is distilled onto an aluminium cathode which is then heated to 350-400 DEG C. in an inert atmosphere. In operation, the cathode has a surface-film of oxide.
GB31793/34A 1933-11-03 1934-11-05 Improvements in or relating to electric discharge devices Expired GB445948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE445948X 1933-11-03

Publications (1)

Publication Number Publication Date
GB445948A true GB445948A (en) 1936-04-22

Family

ID=6537818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31793/34A Expired GB445948A (en) 1933-11-03 1934-11-05 Improvements in or relating to electric discharge devices

Country Status (2)

Country Link
FR (1) FR775170A (en)
GB (1) GB445948A (en)

Also Published As

Publication number Publication date
FR775170A (en) 1934-12-21

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