GB1394370A - Electrodes - Google Patents

Electrodes

Info

Publication number
GB1394370A
GB1394370A GB2559472A GB2559472A GB1394370A GB 1394370 A GB1394370 A GB 1394370A GB 2559472 A GB2559472 A GB 2559472A GB 2559472 A GB2559472 A GB 2559472A GB 1394370 A GB1394370 A GB 1394370A
Authority
GB
United Kingdom
Prior art keywords
cathode
cathodes
electron
enclosure
june
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
GB2559472A
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.)
TDK Micronas GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
ITT Industries Inc
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 Deutsche ITT Industries GmbH, ITT Industries Inc filed Critical Deutsche ITT Industries GmbH
Publication of GB1394370A publication Critical patent/GB1394370A/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
    • H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
    • 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
    • H01J9/045—Activation of assembled cathode

Abstract

1394370 Cathode materials ITT INDUSTRIES Inc 1 June 1972 [7 June 1971 19 Nov 1971] 25594/72 Heading H1D The electron emissivity of a cathode is increased by heating a cathode comprising a fused mass of electron emissive material above 525‹ C. and then cooling it in an inert atmosphere in an enclosure other than the enclosure in which the cathode is to be used. A cold cathode 1 for use in a fluorescent lamp comprises an iron cup 2 containing Ta and BaO as described in Specification 1,394,068. One or more cathodes are placed in a Ta tray 3 with a perforated led 5 and protected by a porous refractory blanket 4 of asbestos, quartz wool or paper. The tray and cathodes are placed in a bell jar which is either evacuated or filled with A, Xe or Kr and heated by an electric current to 1175‹ C. for 10 minutes then cooled. The cathodes remain unaffected by dry air for a short time. Alternatively cathodes are heated in a muffle furnace or by a h.f. coil. The method is used for electrodes for neon lamps and electron tubes; for fluorescent lamps it reduces the ignition voltage.
GB2559472A 1971-06-07 1972-06-01 Electrodes Expired GB1394370A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15031071A 1971-06-07 1971-06-07
US20039871A 1971-11-19 1971-11-19

Publications (1)

Publication Number Publication Date
GB1394370A true GB1394370A (en) 1975-05-14

Family

ID=26847526

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2559472A Expired GB1394370A (en) 1971-06-07 1972-06-01 Electrodes

Country Status (6)

Country Link
BE (1) BE784489A (en)
CA (1) CA958068A (en)
DE (1) DE2226433A1 (en)
FR (1) FR2140518B1 (en)
GB (1) GB1394370A (en)
NL (1) NL7207673A (en)

Also Published As

Publication number Publication date
NL7207673A (en) 1972-12-11
FR2140518A1 (en) 1973-01-19
CA958068A (en) 1974-11-19
FR2140518B1 (en) 1978-03-03
DE2226433A1 (en) 1972-12-28
BE784489A (en) 1972-12-07

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees