GB179565A - - Google Patents

Info

Publication number
GB179565A
GB179565A GB1298522A GB1298522A GB179565A GB 179565 A GB179565 A GB 179565A GB 1298522 A GB1298522 A GB 1298522A GB 1298522 A GB1298522 A GB 1298522A GB 179565 A GB179565 A GB 179565A
Authority
GB
United Kingdom
Prior art keywords
mixture
coating
cathode
weight
parts
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
GB1298522A
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
Publication of GB179565A publication Critical patent/GB179565A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Discharge Lamp (AREA)

Abstract

179,565. Wehnelt, A. May 6, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Vacuum tubes.-The oxide coating of a cathode, or an electron-emitting body adjacent to the cathode, consists of a mixture of the oxides or hydroxides of the alkaline-earth metals. The mixture may be applied as a coating, or compressed as powder in moulds and heated. Such a coating will adhere not only to platinum and iridium but also to the base metals such as nickel and tungsten. The mixture may consist of 90 parts by weight of calcium hydroxide and 5 parts by weight of barium and strontium hydroxides respectively. Sticks may be made by compress. ing and heating the powdered mixture after moistening if necessary with water, alcohol,. acids, or solutions of salts.
GB1298522A 1921-05-07 1922-05-08 Expired GB179565A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW58277D DE543440C (en) 1921-05-07 1921-05-07 Cathode for discharge tubes

Publications (1)

Publication Number Publication Date
GB179565A true GB179565A (en) 1923-11-08

Family

ID=7605442

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1298522A Expired GB179565A (en) 1921-05-07 1922-05-08

Country Status (3)

Country Link
DE (1) DE543440C (en)
FR (1) FR551008A (en)
GB (1) GB179565A (en)

Also Published As

Publication number Publication date
FR551008A (en) 1923-03-26
DE543440C (en) 1932-02-06

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