GB777499A - Improvements in and relating to indirectly-heated cathodes - Google Patents

Improvements in and relating to indirectly-heated cathodes

Info

Publication number
GB777499A
GB777499A GB45355A GB45355A GB777499A GB 777499 A GB777499 A GB 777499A GB 45355 A GB45355 A GB 45355A GB 45355 A GB45355 A GB 45355A GB 777499 A GB777499 A GB 777499A
Authority
GB
United Kingdom
Prior art keywords
per cent
less
indirectly
relating
heated cathodes
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
GB45355A
Inventor
William Ernest Frederi Coveney
Charles Harold Raymond Gentry
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve 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
Priority to BE544157D priority Critical patent/BE544157A/xx
Application filed by Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB45355A priority patent/GB777499A/en
Priority to ES0225919A priority patent/ES225919A1/en
Publication of GB777499A publication Critical patent/GB777499A/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

  • Solid Thermionic Cathode (AREA)
  • Discharge Lamp (AREA)

Abstract

An indirectly-heated cathode for electron-discharge apparatus comprises a barium-containing alkaline earth oxide coating on a core of Ni-Mn alloy containing more than 0.15 per cent but not more than 1.0 per cent by weight of Mn. The alloy may also contain one or more of the following elements Mg 0.01-0.1 per cent, Si 0.05-0.1 per cent, C less than 0.08 per cent, S less than 0.005 per cent, Cu less than 0.1 per cent, Co less than 1.0 per cent and Fe less than 0.2 per cent.
GB45355A 1955-01-06 1955-01-06 Improvements in and relating to indirectly-heated cathodes Expired GB777499A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE544157D BE544157A (en) 1955-01-06
GB45355A GB777499A (en) 1955-01-06 1955-01-06 Improvements in and relating to indirectly-heated cathodes
ES0225919A ES225919A1 (en) 1955-01-06 1956-01-03 Improvements in and relating to indirectly-heated cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45355A GB777499A (en) 1955-01-06 1955-01-06 Improvements in and relating to indirectly-heated cathodes

Publications (1)

Publication Number Publication Date
GB777499A true GB777499A (en) 1957-06-26

Family

ID=9704616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB45355A Expired GB777499A (en) 1955-01-06 1955-01-06 Improvements in and relating to indirectly-heated cathodes

Country Status (3)

Country Link
BE (1) BE544157A (en)
ES (1) ES225919A1 (en)
GB (1) GB777499A (en)

Also Published As

Publication number Publication date
ES225919A1 (en) 1956-02-16
BE544157A (en)

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