GB699977A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB699977A
GB699977A GB10393/51A GB1039351A GB699977A GB 699977 A GB699977 A GB 699977A GB 10393/51 A GB10393/51 A GB 10393/51A GB 1039351 A GB1039351 A GB 1039351A GB 699977 A GB699977 A GB 699977A
Authority
GB
United Kingdom
Prior art keywords
nickel
coating
reduced
tungsten
filament
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
GB10393/51A
Inventor
Charles Harold Raymond Gentry
Alban William James Gollin
Nora Herzfeld
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
Priority to BE511131D priority Critical patent/BE511131A/xx
Priority to NL89643D priority patent/NL89643C/xx
Application filed by Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB10393/51A priority patent/GB699977A/en
Priority to DEN5441A priority patent/DE911876C/en
Priority to CH307771D priority patent/CH307771A/en
Priority to US285562A priority patent/US2748033A/en
Publication of GB699977A publication Critical patent/GB699977A/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)
  • Solid Thermionic Cathode (AREA)
  • Catalysts (AREA)

Abstract

699,977. Cathode materials and processing. MULLARD RADIO VALVE CO., Ltd. Feb. 15, 1952 [May 3, 1951], No. 10393/51. Class 39(i) The cathode core or filament is coated with a mixture of one or more carbonates of alkaline earth metal and a compound of one or more of nickel, cobalt, tungsten, molybdenum, platinum, iridium, osmium, rhodium, and ruthenium which is reduced by heat, with or without a reducing agent, to produce metal which is 10-90 per cent of the coating, the alkaline oxide being produced by the further step of heating the coating. The coating may be applied to a nickel sleeve or a tungsten or nickel filament by dipping, spraying or electrophoresis, and the metal compound may be reduced at the same time as the carbonate is reduced to oxide. Specified proportions of barium and strontium carbonate and nickel formate may be ballmilled in butylacetate and a binder consisting of nitrocellulose, diethyl oxalate, amyl acetate and ethyl alcohol to form a dip or spray paste.
GB10393/51A 1951-05-03 1951-05-03 Improvements in or relating to thermionic cathodes Expired GB699977A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE511131D BE511131A (en) 1951-05-03
NL89643D NL89643C (en) 1951-05-03
GB10393/51A GB699977A (en) 1951-05-03 1951-05-03 Improvements in or relating to thermionic cathodes
DEN5441A DE911876C (en) 1951-05-03 1952-04-29 Process for the production of cathodes of electrical discharge tubes and electrical discharge tubes with a cathode produced according to this process
CH307771D CH307771A (en) 1951-05-03 1952-05-01 Process for producing a cathode for electric discharge tubes and cathode produced by this process.
US285562A US2748033A (en) 1951-05-03 1952-05-01 Method of making gas discharge tube and rectifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10393/51A GB699977A (en) 1951-05-03 1951-05-03 Improvements in or relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB699977A true GB699977A (en) 1953-11-18

Family

ID=9967000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10393/51A Expired GB699977A (en) 1951-05-03 1951-05-03 Improvements in or relating to thermionic cathodes

Country Status (6)

Country Link
US (1) US2748033A (en)
BE (1) BE511131A (en)
CH (1) CH307771A (en)
DE (1) DE911876C (en)
GB (1) GB699977A (en)
NL (1) NL89643C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755205A (en) * 1972-03-28 1973-08-28 Us Army Method of making a catalytic bed

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1894059A (en) * 1927-04-08 1933-01-10 Forest Radio Company De Process for producing electron emitters and the product
US2049372A (en) * 1934-11-19 1936-07-28 Gen Electric Emissive coating for cathodes and method for preparing the same
US2430520A (en) * 1945-03-06 1947-11-11 Glass Science Inc Deposition of metal on glass from metal formates

Also Published As

Publication number Publication date
BE511131A (en)
CH307771A (en) 1955-06-15
NL89643C (en)
US2748033A (en) 1956-05-29
DE911876C (en) 1954-05-20

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