GB795566A - Improvements in or relating to thermionic dispenser cathodes - Google Patents

Improvements in or relating to thermionic dispenser cathodes

Info

Publication number
GB795566A
GB795566A GB3626/56A GB362656A GB795566A GB 795566 A GB795566 A GB 795566A GB 3626/56 A GB3626/56 A GB 3626/56A GB 362656 A GB362656 A GB 362656A GB 795566 A GB795566 A GB 795566A
Authority
GB
United Kingdom
Prior art keywords
cathode
materials
feb
given
refractory metal
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
GB3626/56A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB795566A publication Critical patent/GB795566A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

795,566. Cathode materials. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 6, 1956 [Feb. 9, 1955], No. 3626/56. Drawing to Specification. Class 39(1). In a dispenser cathode in which the emissive material is dispersed throughout a body of porous refractory metal, said material consists of a fused mixture of (a) barium oxide, (b) aluminium oxide and/or boric oxide, and (c) one or more of the oxides of calcium, strontium, and magnesium ; the mole ratio of (a) to (b) is in excess of 1 : 1. The cathode may be made either by compressing and heating a powdered mixture of the refractory metal and the prefused compounds, or by impregnation. Preferred proportions of materials, and temperatures, are given for each of these methods. Some experimental data showing relative emission for various proportions of constituent materials is given. Specifications 734,209 and 734,311 are referred to.
GB3626/56A 1955-02-09 1956-02-06 Improvements in or relating to thermionic dispenser cathodes Expired GB795566A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US345082XA 1955-02-09 1955-02-09

Publications (1)

Publication Number Publication Date
GB795566A true GB795566A (en) 1958-05-28

Family

ID=21876846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3626/56A Expired GB795566A (en) 1955-02-09 1956-02-06 Improvements in or relating to thermionic dispenser cathodes

Country Status (6)

Country Link
BE (1) BE545032A (en)
CH (1) CH345082A (en)
DE (1) DE1160552B (en)
FR (1) FR1140832A (en)
GB (1) GB795566A (en)
NL (1) NL99051C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004424A1 (en) * 1978-03-23 1979-10-03 Thorn Emi-Varian Limited Thermionic cathode
DE3122950A1 (en) * 1981-06-10 1983-01-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Process for fabricating a dispenser cathode

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE515834A (en) * 1951-11-29

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004424A1 (en) * 1978-03-23 1979-10-03 Thorn Emi-Varian Limited Thermionic cathode
DE3122950A1 (en) * 1981-06-10 1983-01-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Process for fabricating a dispenser cathode

Also Published As

Publication number Publication date
NL99051C (en)
BE545032A (en)
CH345082A (en) 1960-03-15
DE1160552B (en) 1964-01-02
FR1140832A (en) 1957-08-14

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