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GB473398A - Improvements in surfaces of high secondary-electron emission and methods of manufacturing such surfaces - Google Patents

Improvements in surfaces of high secondary-electron emission and methods of manufacturing such surfaces

Info

Publication number
GB473398A
GB473398A GB3725/37A GB372537A GB473398A GB 473398 A GB473398 A GB 473398A GB 3725/37 A GB3725/37 A GB 3725/37A GB 372537 A GB372537 A GB 372537A GB 473398 A GB473398 A GB 473398A
Authority
GB
United Kingdom
Prior art keywords
carbon
metals
feb
adsorbed
oxide
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
GB3725/37A
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
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 filed Critical Philips Gloeilampenfabrieken NV
Publication of GB473398A publication Critical patent/GB473398A/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
    • 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
    • H01J1/32—Secondary-electron-emitting electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Discharge Lamp (AREA)

Abstract

473,398. Electrode materials. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Feb. 8, 1937, No. 3725. Convention date, Feb. 10, 1936. [Class 39 (i)] A surface having a high secondary emission comprises a layer of carbon of high adsorption having adsorbed to it one or more of the metals magnesium, calcium, barium and strontium. In one method a supporting body such as nickel is coated with one or more oxides or hydroxides of the specified metals, such as magnesium oxide, and is then heated by high frequency in an atmosphere of a hydrocarbon such as acetylene or methane. The surface is subsequently heated in a vacuum to 900-1000‹ C., when the partial reduction of the oxide by the carbon produces metal which is adsorbed to the carbon. Five or six secondary electrons may be emitted per primary electron. The Specification as open to inspection under Sect. 91 refers to the use of one or more metals of the second principal group of Mendeleef's periodic table, of atomic number greater than 4. This subject-matter does not appear in the Specification as accepted.
GB3725/37A 1936-02-10 1937-02-08 Improvements in surfaces of high secondary-electron emission and methods of manufacturing such surfaces Expired GB473398A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE473398X 1936-02-10

Publications (1)

Publication Number Publication Date
GB473398A true GB473398A (en) 1937-10-12

Family

ID=6541560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3725/37A Expired GB473398A (en) 1936-02-10 1937-02-08 Improvements in surfaces of high secondary-electron emission and methods of manufacturing such surfaces

Country Status (4)

Country Link
US (1) US2146099A (en)
BE (1) BE419911A (en)
FR (1) FR817503A (en)
GB (1) GB473398A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530167A (en) * 1944-12-14 1950-11-14 Hartford Nat Bank & Trust Co Discharge tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE446289A (en) * 1941-07-03
NL208204A (en) * 1955-06-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530167A (en) * 1944-12-14 1950-11-14 Hartford Nat Bank & Trust Co Discharge tube

Also Published As

Publication number Publication date
FR817503A (en) 1937-09-04
US2146099A (en) 1939-02-07
BE419911A (en)

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