GB729819A - Improvements in or relating to emissive cathodes - Google Patents

Improvements in or relating to emissive cathodes

Info

Publication number
GB729819A
GB729819A GB2962351A GB2962351A GB729819A GB 729819 A GB729819 A GB 729819A GB 2962351 A GB2962351 A GB 2962351A GB 2962351 A GB2962351 A GB 2962351A GB 729819 A GB729819 A GB 729819A
Authority
GB
United Kingdom
Prior art keywords
zirconium
cathode
wire
zirconate
dec
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
GB2962351A
Inventor
John Norman Aldington
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.)
Siemens Electric Lamps and Supplies Ltd
Original Assignee
Siemens Electric Lamps and Supplies Ltd
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 Siemens Electric Lamps and Supplies Ltd filed Critical Siemens Electric Lamps and Supplies Ltd
Priority to GB2962351A priority Critical patent/GB729819A/en
Publication of GB729819A publication Critical patent/GB729819A/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

729,819. Cathode materials. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd. Dec. 4, 1952 [Dec. 18, 1951], No. 29623/51. Class 39 (1). Alkaline earth is converted to zirconate by heating on a zirconium wire to form the cathode. The wire may consist of tungsten which contains 1-10 per cent of zirconium or is coated with zirconium powder or of a zirconium wire wound on a tungsten support which is wound onto a helix and coated with oxide or carbonate or silicate of alkaline earth metal such as barium or strontium. The cathode is heated to 1500 ‹ C. in an inert gas or vacuum, preferably within the electric discharge lamp, to produce zirconate.
GB2962351A 1951-12-18 1951-12-18 Improvements in or relating to emissive cathodes Expired GB729819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2962351A GB729819A (en) 1951-12-18 1951-12-18 Improvements in or relating to emissive cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2962351A GB729819A (en) 1951-12-18 1951-12-18 Improvements in or relating to emissive cathodes

Publications (1)

Publication Number Publication Date
GB729819A true GB729819A (en) 1955-05-11

Family

ID=10294491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2962351A Expired GB729819A (en) 1951-12-18 1951-12-18 Improvements in or relating to emissive cathodes

Country Status (1)

Country Link
GB (1) GB729819A (en)

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