GB420289A - Improvements in incandescent cathodes - Google Patents

Improvements in incandescent cathodes

Info

Publication number
GB420289A
GB420289A GB25343/34A GB2534334A GB420289A GB 420289 A GB420289 A GB 420289A GB 25343/34 A GB25343/34 A GB 25343/34A GB 2534334 A GB2534334 A GB 2534334A GB 420289 A GB420289 A GB 420289A
Authority
GB
United Kingdom
Prior art keywords
cathode
cavity
graphite
sept
covered
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
GB25343/34A
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 GB420289A publication Critical patent/GB420289A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens
    • H01J17/06—Cathodes

Landscapes

  • Gas-Filled Discharge Tubes (AREA)

Abstract

420,289. Thermionic cathodes. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. Sept. 3, 1934, No. 25343. Convention date, Sept. 7, 1933. [Class 39 (i)] A cathode having an activated surface is constituted by a body consisting of carbon, for instance graphite, and an insulated heater wire inserted in cavities in the body. The cathode may be shaped as a container coated internally and externally with oxides, and a cavity in it may contain a roll of metal gauze coated with oxide. The graphite may be covered with copper to which a nickel layer is applied. As shown, a graphite block 1 having a cavity 2 is covered with a nickel layer 7 to which the oxide layer 7 is applied. The heater wire is inserted in a cavity 4 and is insulated by a baked on insulating material, such as porcelain. The walls of the cathode may be provided with a large number of small cavities to increase the emitting surface. The invention is particularly applicable to gas-filled tubes.
GB25343/34A 1933-09-07 1934-09-03 Improvements in incandescent cathodes Expired GB420289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE420289X 1933-09-07

Publications (1)

Publication Number Publication Date
GB420289A true GB420289A (en) 1934-11-28

Family

ID=6450765

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25343/34A Expired GB420289A (en) 1933-09-07 1934-09-03 Improvements in incandescent cathodes

Country Status (2)

Country Link
FR (1) FR777070A (en)
GB (1) GB420289A (en)

Also Published As

Publication number Publication date
FR777070A (en) 1935-02-11

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