GB737883A - Improvements in or relating to thermionic valves - Google Patents

Improvements in or relating to thermionic valves

Info

Publication number
GB737883A
GB737883A GB1422052A GB1422052A GB737883A GB 737883 A GB737883 A GB 737883A GB 1422052 A GB1422052 A GB 1422052A GB 1422052 A GB1422052 A GB 1422052A GB 737883 A GB737883 A GB 737883A
Authority
GB
United Kingdom
Prior art keywords
coating
cathode
mixture
metal
alkaline earth
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
GB1422052A
Inventor
Nora Fry
Charles Harold Raymond Gentry
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve Co Ltd
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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB1422052A priority Critical patent/GB737883A/en
Publication of GB737883A publication Critical patent/GB737883A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

  • Solid Thermionic Cathode (AREA)

Abstract

737,883. Cathode materials and processing. MULLARD RADIO VALVE CO., Ltd. June 1, 1953 [June 5, 1952], No. 14220/52. Class 39 (1). A thermionic valve comprises a cathode, at least a control grid and an anode contained in an evacuated envelope wherein the cathode comprises a metal core, containing impurities, coated with a double or triple oxide coating, which cathode has been prepared by carrying out the steps of preparing a mixture containing a double or triple alkaline earth carbonate and a finelydivided powdered metal or metals from the group consisting of nickel, cobalt, tungsten, molybdenum, platinum, iridium, osmium, palladium, ruthenium, or alloys thereof, coating the metal core with the mixture, and forming the cathode by heating the mixture to decompose the alkaline earth carbonate to the oxide, the quantity of metal from the said group in the coating being from 10 atom per cent to 90 atom per cent. Preferably the powdered metal is nickel having a particle size of less than 10 microns. The powdered metal is intimately mixed with the alkaline earth carbonate in a binder in a suitable solvent-examples are described-and the mixture applied to the cathode core by drag-coating, catophoretic coating or spray-coating.
GB1422052A 1952-06-05 1952-06-05 Improvements in or relating to thermionic valves Expired GB737883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1422052A GB737883A (en) 1952-06-05 1952-06-05 Improvements in or relating to thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1422052A GB737883A (en) 1952-06-05 1952-06-05 Improvements in or relating to thermionic valves

Publications (1)

Publication Number Publication Date
GB737883A true GB737883A (en) 1955-10-05

Family

ID=10037208

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1422052A Expired GB737883A (en) 1952-06-05 1952-06-05 Improvements in or relating to thermionic valves

Country Status (1)

Country Link
GB (1) GB737883A (en)

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