GB613946A - Improvements in or relating to thermionic tubes having a secondary-emission electrode - Google Patents

Improvements in or relating to thermionic tubes having a secondary-emission electrode

Info

Publication number
GB613946A
GB613946A GB7441/46A GB744146A GB613946A GB 613946 A GB613946 A GB 613946A GB 7441/46 A GB7441/46 A GB 7441/46A GB 744146 A GB744146 A GB 744146A GB 613946 A GB613946 A GB 613946A
Authority
GB
United Kingdom
Prior art keywords
reduction
oxide
tube
activated
oxides
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
GB7441/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken 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 Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB613946A publication Critical patent/GB613946A/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
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H01J7/183—Composition or manufacture of getters
    • 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
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/938—Vapor deposition or gas diffusion
    • 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
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y10T428/12069—Plural nonparticulate metal components
    • Y10T428/12076—Next to each other
    • 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
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y10T428/12097—Nonparticulate component encloses particles
    • 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
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12778—Alternative base metals from diverse categories

Landscapes

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

Abstract

613,946. Cathode materials and processing. PHILIPS LAMPS, Ltd. March 9, 1946, No. 7441. Convention date, July 3, 1941. [Class 39 (i)] In a thermionic tube containing at least one secondary-emission electrode activated with caesium oxide, the non-activated parts of the surface are covered with the product obtained by reduction at a low temperature of one or more of the oxides of nickel, tungsten, or molybdenum. The reduction may be only partial and may be effected during about 10 minutes at a temperature of 700‹ C. in a hydrogen atmosphere. The product is a black form of the metal, with or without admixed oxide, and has a high thermal emissivity ; it is capable of absorbing small quantities of free caesium generated within the tube. The oxide may be applied by spraying, dipping or cataphoresis before insertion of the electrode into the tube, the reduction being effected after insertion. The Specification as open to inspection under Sect. 91 includes zirconium as one of the metals of which the oxides may be used for coating the non-activated parts. This subject-matter does not appear in the Specification as accepted.
GB7441/46A 1941-07-03 1946-03-09 Improvements in or relating to thermionic tubes having a secondary-emission electrode Expired GB613946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL242721X 1941-07-03

Publications (1)

Publication Number Publication Date
GB613946A true GB613946A (en) 1948-12-07

Family

ID=19780661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7441/46A Expired GB613946A (en) 1941-07-03 1946-03-09 Improvements in or relating to thermionic tubes having a secondary-emission electrode

Country Status (6)

Country Link
US (1) US2472189A (en)
BE (1) BE446289A (en)
CH (1) CH242721A (en)
FR (1) FR883717A (en)
GB (1) GB613946A (en)
NL (1) NL59008C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858470A (en) * 1955-02-02 1958-10-28 Bell Telephone Labor Inc Cathode for electron discharge devices
US2996795A (en) * 1955-06-28 1961-08-22 Gen Electric Thermionic cathodes and methods of making
US3041209A (en) * 1955-06-28 1962-06-26 Gen Electric Method of making a thermionic cathode
BE638686A (en) * 1962-10-17
US3376461A (en) * 1964-12-28 1968-04-02 Varian Associates Thermionic cathodes and high frequency electron discharge devices
US3958146A (en) * 1974-02-08 1976-05-18 Gte Sylvania Incorporated Fast warm up picture tube cathode cap having high heat emissivity surface on the interior thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE419911A (en) * 1936-02-10
US2123024A (en) * 1936-05-29 1938-07-05 Rca Corp Electrode for electric discharge devices
BE427143A (en) * 1937-03-25
NL50264C (en) * 1937-04-02
US2171227A (en) * 1937-08-09 1939-08-29 Philips Nv Secondary electron emitter and method of making it
US2204252A (en) * 1938-07-28 1940-06-11 Fides Gmbh Secondary electron emitter and method of making it

Also Published As

Publication number Publication date
FR883717A (en) 1943-07-13
US2472189A (en) 1949-06-07
BE446289A (en)
NL59008C (en)
CH242721A (en) 1946-05-31

Similar Documents

Publication Publication Date Title
GB648955A (en) Improvements in electron-emitting electrodes for electric discharge tubes
GB1055729A (en) Cathode ray tubes
GB613946A (en) Improvements in or relating to thermionic tubes having a secondary-emission electrode
US2232083A (en) Method of producing surfaces of high heat radiation
GB462706A (en) Improvements in or relating to cathodes for electron discharge devices
GB1274528A (en) Improvements in or relating to metal vapour generators
GB430853A (en) Improvements in or relating to indirectly heated cathodes for electron discharge tubes
GB496556A (en) Improvements in electrodes for electron discharge devices
US3041210A (en) Method of making cold cathodes for vacuum tubes and article
GB267142A (en) Improvements in thermionic electrodes
GB1032208A (en) Improvements in or relating to electron discharge device
GB838099A (en) Improvements in or relating to indirectly heated incandescent cathodes
GB659798A (en) Improvements in and relating to x-ray tubes
JPS5233474A (en) Manufacturing process of flat electron ray indicator tube
GB459163A (en) Improvements in and relating to electric discharge tubes
GB367336A (en) Process for the manufacture of hot cathodes for electric discharge tubes
GB822553A (en) Electric low-pressure discharge tubes, more particularly fluorescent lamps
GB583179A (en) Improvements relating to vacuum tubes
GB824902A (en) Improvements in cathodes and emissive material therefor
GB566542A (en) Improvements in high frequency electronic discharge devices
GB781385A (en) Improvements in or relating to electrodes for electron discharge devices
GB558336A (en) Improvements relating to electric devices having an enclosing envelope
GB737168A (en) Improvements in or relating to discharge tubes
GB881797A (en) Improvements in grids for electron tubes
GB550856A (en) Improvements in or relating to closure members for vacuum tubes