GB778339A - Method of coating cathodes for electric discharge devices - Google Patents

Method of coating cathodes for electric discharge devices

Info

Publication number
GB778339A
GB778339A GB18338/55A GB1833855A GB778339A GB 778339 A GB778339 A GB 778339A GB 18338/55 A GB18338/55 A GB 18338/55A GB 1833855 A GB1833855 A GB 1833855A GB 778339 A GB778339 A GB 778339A
Authority
GB
United Kingdom
Prior art keywords
cathode
electric discharge
coating
discharge devices
per cent
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
GB18338/55A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB778339A publication Critical patent/GB778339A/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)
  • Solid Thermionic Cathode (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Microwave Tubes (AREA)

Abstract

A method of coating a coiled cathode for an electric discharge tube with an electron-emissive material comprises applying to the cathode the desired amount of material dispersed in a liquid vehicle, and vibrating the cathode, e.g. at low audio frequency, while the material is being dried thereon by evaporation of the vehicle. The coating material may comprise by weight 55 per cent strontium carbonate and 45 per cent barium carbonate in nitrocellulose binder, the liquid vehicle being amyl acetate. Vibration is continued for 2 to 3 minutes. The coil is subsequently mounted in the tube and an electric current passed to convert the carbonates into oxides.
GB18338/55A 1954-06-29 1955-06-24 Method of coating cathodes for electric discharge devices Expired GB778339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US439964A US2785093A (en) 1954-06-29 1954-06-29 Method of preparing cathodes for discharge devices

Publications (1)

Publication Number Publication Date
GB778339A true GB778339A (en) 1957-07-03

Family

ID=23746855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18338/55A Expired GB778339A (en) 1954-06-29 1955-06-24 Method of coating cathodes for electric discharge devices

Country Status (3)

Country Link
US (1) US2785093A (en)
DE (1) DE1038656B (en)
GB (1) GB778339A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934670A (en) * 1956-11-05 1960-04-26 Columbia Broadcasting Syst Inc Electron tubes and method of making same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210761A (en) * 1936-10-07 1940-08-06 Gen Electric Cathode
NL76841C (en) * 1940-11-23
US2269129A (en) * 1941-07-05 1942-01-06 Du Mont Allen B Lab Inc Application of fluorescent material to electron tubes
US2362510A (en) * 1942-01-03 1944-11-14 Raytheon Mfg Co Emissive filament and method of making
US2431135A (en) * 1944-03-29 1947-11-18 Westinghouse Electric Corp Apparatus for coating cathodes
US2464568A (en) * 1945-05-14 1949-03-15 Gen Electric Electrical coil insulated with thermoplastic particles and thermoset polymer
US2545909A (en) * 1948-12-22 1951-03-20 Gen Electric Apparatus for applying emission material to cathodes
US2561768A (en) * 1950-04-10 1951-07-24 Zenith Radio Corp Thermionic cathode activation

Also Published As

Publication number Publication date
DE1038656B (en) 1958-09-11
US2785093A (en) 1957-03-12

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