GB339057A - Improvements in or relating to electron emitting cathodes for electric discharge devices - Google Patents

Improvements in or relating to electron emitting cathodes for electric discharge devices

Info

Publication number
GB339057A
GB339057A GB3148429A GB3148429A GB339057A GB 339057 A GB339057 A GB 339057A GB 3148429 A GB3148429 A GB 3148429A GB 3148429 A GB3148429 A GB 3148429A GB 339057 A GB339057 A GB 339057A
Authority
GB
United Kingdom
Prior art keywords
electron
electric discharge
relating
core
emitting
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
GB3148429A
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.)
Parlophone Records Ltd
Original Assignee
Gramophone Co 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 Gramophone Co Ltd filed Critical Gramophone Co Ltd
Priority to GB3148429A priority Critical patent/GB339057A/en
Publication of GB339057A publication Critical patent/GB339057A/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
    • H01J1/26—Supports for the emissive material

Landscapes

  • Discharge Lamp (AREA)

Abstract

339,057. Gramophone Co., Ltd., Tedham, W. F., and Ellington, F. Oct. 16. 1929. Vacuum. tubes.-In electron-emitting cathode for an electric discharge device comprises a core or layer of aluminium provided with an oxidized surface having an electron-emitting coating thereon. The electron-emitting coating may comprise caesium, barium, or other metal deposited electrolytically or otherwise upon a core of aluminium which has been coated with a layer of oxide by making it the anode in a weak solution of chromic acid. Alternatively, an electron-emitting material may be deposited upon an oxidized aluminium surface formed upon a core of either conducting or non-conducting material such as tungsten or kaolin.
GB3148429A 1929-10-16 1929-10-16 Improvements in or relating to electron emitting cathodes for electric discharge devices Expired GB339057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3148429A GB339057A (en) 1929-10-16 1929-10-16 Improvements in or relating to electron emitting cathodes for electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3148429A GB339057A (en) 1929-10-16 1929-10-16 Improvements in or relating to electron emitting cathodes for electric discharge devices

Publications (1)

Publication Number Publication Date
GB339057A true GB339057A (en) 1930-12-04

Family

ID=10323784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3148429A Expired GB339057A (en) 1929-10-16 1929-10-16 Improvements in or relating to electron emitting cathodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB339057A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750593C (en) * 1938-03-23 1945-01-22 Electron-optical device, in particular Braun's tube, television tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750593C (en) * 1938-03-23 1945-01-22 Electron-optical device, in particular Braun's tube, television tube

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