GB666053A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB666053A
GB666053A GB23374/49A GB2337449A GB666053A GB 666053 A GB666053 A GB 666053A GB 23374/49 A GB23374/49 A GB 23374/49A GB 2337449 A GB2337449 A GB 2337449A GB 666053 A GB666053 A GB 666053A
Authority
GB
United Kingdom
Prior art keywords
sintered
molybdenum
thoria
sept
tungsten
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
GB23374/49A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB666053A publication Critical patent/GB666053A/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y10T428/2958—Metal or metal compound in coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/298—Physical dimension

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

666,053. Cathode materials and processing. PHILIPS ELECTRICAL, Ltd. Sept. 9, 1949 [Sept. 14, 1948], No. 23374/49. Class 39 (i). A thermionic cathode consists of a sintered mixture of thorium oxide and a refractory metal, such as tungsten, to which is sintered a coating of thorium oxide without a supporting metal layer. Equal quantities of thoria and tungsten are mixed, compressed to form a tube (dimensions are specified), sintered in hydrogen at 1900‹ C., coated with thoria 50 microns thick, and again sintered. Molybdenum end caps may be provided by a mixture of molybdenum powder and ammonium molybdate and are sintered to molybdenum leads. The emission may be 50 amps per square cm. at 2200‹ K. The cathodes may be heated by the gas discharge in a lamp.
GB23374/49A 1948-09-14 1949-09-09 Improvements in or relating to thermionic cathodes Expired GB666053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL278121X 1948-09-14

Publications (1)

Publication Number Publication Date
GB666053A true GB666053A (en) 1952-02-06

Family

ID=19782192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23374/49A Expired GB666053A (en) 1948-09-14 1949-09-09 Improvements in or relating to thermionic cathodes

Country Status (7)

Country Link
US (1) US2614942A (en)
BE (1) BE491070A (en)
CH (1) CH278121A (en)
DE (1) DE813573C (en)
FR (1) FR995225A (en)
GB (1) GB666053A (en)
NL (1) NL70864C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717975A (en) * 1951-03-30 1955-09-13 Wihtol Weltis Cathodes for electron tubes
DE1009727B (en) * 1953-01-10 1957-06-06 Deutsche Elektronik Gmbh Process for producing solid, well-adhering emission layers made of thorium oxide on a carrier metal made of tungsten or molybdenum
US2845515A (en) * 1953-03-12 1958-07-29 Raytheon Mfg Co Semimetallic resistive filaments
US2881512A (en) * 1954-06-16 1959-04-14 Cie Generale De Telegraphite S Composition for sintered barium cathodes
US2847328A (en) * 1957-03-04 1958-08-12 James E Cline Method of making thorium oxide cathodes
DE1080700B (en) * 1958-05-17 1960-04-28 Deutsche Elektronik Gmbh Process for the production of an indirectly heated cathode, in particular for magnetrons with high oscillating power, and cathode produced according to this process
US3558966A (en) * 1967-03-01 1971-01-26 Semicon Associates Inc Directly heated dispenser cathode
US3973155A (en) * 1975-01-31 1976-08-03 Westinghouse Electric Corporation Incandescent source of visible radiations
US4438557A (en) * 1979-05-01 1984-03-27 Woodland International Corporation Method of using an areal array of tubular electron sources
US4333035A (en) * 1979-05-01 1982-06-01 Woodland International Corporation Areal array of tubular electron sources
US20090085463A1 (en) * 2007-09-28 2009-04-02 General Electric Company Thermo-optically functional compositions, systems and methods of making

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2339392A (en) * 1942-10-06 1944-01-18 Rca Corp Cathode
US2477601A (en) * 1947-06-11 1949-08-02 Raytheon Mfg Co Directly heated cathode

Also Published As

Publication number Publication date
DE813573C (en) 1951-09-13
BE491070A (en)
FR995225A (en) 1951-11-29
US2614942A (en) 1952-10-21
CH278121A (en) 1951-09-30
NL70864C (en)

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