GB640381A - Cathode and method of making - Google Patents

Cathode and method of making

Info

Publication number
GB640381A
GB640381A GB21081/47A GB2108147A GB640381A GB 640381 A GB640381 A GB 640381A GB 21081/47 A GB21081/47 A GB 21081/47A GB 2108147 A GB2108147 A GB 2108147A GB 640381 A GB640381 A GB 640381A
Authority
GB
United Kingdom
Prior art keywords
centrifuge
suspension
cathode
hours
emissive material
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
GB21081/47A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products 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
Priority claimed from US595309A external-priority patent/US2433821A/en
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB640381A publication Critical patent/GB640381A/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)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

A cathode of an electronic discharge device is coated with electron - emissive material from a suspension by the use of a centrifuge. The suspension may consist of a mixture of barium, strontium and calcium carbonates in a two per cent solution of nitrocellulose in amyl acetate. Tubular cathodes 7, surrounded with metallic mesh between the flanges 13, are shown in a centrifuge tube 14. Wooden plugs 16 prevent entry of the suspension into the inside of the cathode. The centrifuge is operated for 45 minutes, the clear liquid siphoned off and more suspension added up to the original level. It is stated that when operating the centrifuge to give 715 g. for 5 hours with emissive material of particle size 2 microns, the density of the coating was 1.64 grms. per c.c. Densities of 2.4 and 2.6 respectively were produced at a centrifuge speed giving 2250 g. for periods of 5 and 22 hours.
GB21081/47A 1945-05-23 1947-08-01 Cathode and method of making Expired GB640381A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US595309A US2433821A (en) 1945-05-23 1945-05-23 Electron emissive cathode
US794519A US2613164A (en) 1945-05-23 1947-12-30 Method of coating electron emissive cathodes

Publications (1)

Publication Number Publication Date
GB640381A true GB640381A (en) 1950-07-19

Family

ID=27082222

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21081/47A Expired GB640381A (en) 1945-05-23 1947-08-01 Cathode and method of making

Country Status (3)

Country Link
US (1) US2613164A (en)
FR (1) FR989247A (en)
GB (1) GB640381A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830917A (en) * 1954-06-07 1958-04-15 Bell Telephone Labor Inc Cathode for electron discharge devices
US3097112A (en) * 1960-01-12 1963-07-09 Gen Electric Method and apparatus for making cathodes
DE1182743B (en) * 1961-11-10 1964-12-03 Patra Patent Treuhand Anode for a high pressure discharge lamp, in particular for a noble gas high pressure discharge lamp
US3261076A (en) * 1962-01-26 1966-07-19 Philips Corp Method of manufacturing photoelectric cell

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US934833A (en) * 1908-01-09 1909-09-21 Harry G Parker Separating apparatus.
US1217071A (en) * 1916-04-29 1917-02-20 Charles Rust Painting apparatus.
US1532533A (en) * 1919-12-16 1925-04-07 Western Electric Co Colloidal suspension
US1939075A (en) * 1927-01-03 1933-12-12 Westinghouse Electric & Mfg Co Coating composition for electronemitting elements
US2009232A (en) * 1934-07-24 1935-07-23 John M Hood Apparatus for applying waxes, rosins, oils, etc., to textile fibers, yarns, or fabrics
US2119309A (en) * 1934-12-21 1938-05-31 John C Batchelor Method of forming a fluorescent screen
US2158981A (en) * 1936-08-05 1939-05-16 Sprague Specialties Co Electrolytic device
US2355232A (en) * 1941-07-25 1944-08-08 Burgess Battery Co Dry cell apparatus

Also Published As

Publication number Publication date
FR989247A (en) 1951-09-06
US2613164A (en) 1952-10-07

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