GB477637A - Improvements in or relating to indirectly heated thermionic cathodes - Google Patents

Improvements in or relating to indirectly heated thermionic cathodes

Info

Publication number
GB477637A
GB477637A GB2711136A GB2711136A GB477637A GB 477637 A GB477637 A GB 477637A GB 2711136 A GB2711136 A GB 2711136A GB 2711136 A GB2711136 A GB 2711136A GB 477637 A GB477637 A GB 477637A
Authority
GB
United Kingdom
Prior art keywords
coated
heating
relating
indirectly heated
thermionic cathodes
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
GB2711136A
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.)
MO Valve Co Ltd
Original Assignee
MO 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 MO Valve Co Ltd filed Critical MO Valve Co Ltd
Priority to GB2711136A priority Critical patent/GB477637A/en
Publication of GB477637A publication Critical patent/GB477637A/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
    • H01J9/08—Manufacture of heaters for indirectly-heated cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

477,637. Electric resistance heaters. M-O VALVE CO., Ltd., and BENJAMIN, M. Oct. 6, 1936, No. 27111. [Class 39 (iii)] The tungsten filament for heating the cathode of a receiving valve is coated with a suspension of alumina containing a small proportion, e.g. 1 per cent of calcium carbonate or other calcium compound which is converted to the oxide by heating. The diameter of the alumina particles is between 30 Á and 120 Á and the mixture is milled in nitro-cellulose in amyl acetate diluted with alcohol. The coated filament is sintered in hydrogen at 1700‹ C. Tungsten heating filaments for other small metal enclosures may be similarly coated.
GB2711136A 1936-10-06 1936-10-06 Improvements in or relating to indirectly heated thermionic cathodes Expired GB477637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2711136A GB477637A (en) 1936-10-06 1936-10-06 Improvements in or relating to indirectly heated thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2711136A GB477637A (en) 1936-10-06 1936-10-06 Improvements in or relating to indirectly heated thermionic cathodes

Publications (1)

Publication Number Publication Date
GB477637A true GB477637A (en) 1938-01-04

Family

ID=10254364

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2711136A Expired GB477637A (en) 1936-10-06 1936-10-06 Improvements in or relating to indirectly heated thermionic cathodes

Country Status (1)

Country Link
GB (1) GB477637A (en)

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