GB255090A - Improvements in or relating to methods of manufacturing electrodes for electron discharge devices - Google Patents

Improvements in or relating to methods of manufacturing electrodes for electron discharge devices

Info

Publication number
GB255090A
GB255090A GB17235/26A GB1723526A GB255090A GB 255090 A GB255090 A GB 255090A GB 17235/26 A GB17235/26 A GB 17235/26A GB 1723526 A GB1723526 A GB 1723526A GB 255090 A GB255090 A GB 255090A
Authority
GB
United Kingdom
Prior art keywords
coating
mixtures
alkaline earth
relating
earth metals
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
GB17235/26A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB255090A publication Critical patent/GB255090A/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)
  • Discharge Lamp (AREA)

Abstract

255,090. International General Electric Co., Inc., (Assignees of Allgemeine Elektricitõts Ges.). July 13, 1925, [Convention date]. Vacuum tubes.-In the manufacture of oxidecoated cathodes, a core of molybdenum or tantalum is protected against oxidation during heating to fix the coating by carrying out the heating in a vacuum or non-oxidizing atmosphere, such as nitrogen. The coating may consist of the oxides of the alkaline earth metals, or compounds of the elements of the third group or of rare earths, or mixtures of these, for example, mixtures of lanthanum oxide and barium hydroxide, or cerium oxide and barium hydroxide. The surface of a filament may be roughened to obtain firm adhesion of the coating. The electrode may be treated with vapour of hydrocarbons magnesium or the alkali or alkaline earth metals to increase the electron emission.
GB17235/26A 1925-07-13 1926-07-09 Improvements in or relating to methods of manufacturing electrodes for electron discharge devices Expired GB255090A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE255090X 1925-07-13

Publications (1)

Publication Number Publication Date
GB255090A true GB255090A (en) 1927-06-09

Family

ID=5961608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17235/26A Expired GB255090A (en) 1925-07-13 1926-07-09 Improvements in or relating to methods of manufacturing electrodes for electron discharge devices

Country Status (1)

Country Link
GB (1) GB255090A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453753A (en) * 1944-11-04 1948-11-16 Hartford Nat Bank & Trust Co Method of manufacturing cathodes of electric discharge tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453753A (en) * 1944-11-04 1948-11-16 Hartford Nat Bank & Trust Co Method of manufacturing cathodes of electric discharge tubes

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