GB272440A - Incandescent cathode for electric discharge tubes - Google Patents

Incandescent cathode for electric discharge tubes

Info

Publication number
GB272440A
GB272440A GB3270/27A GB327027A GB272440A GB 272440 A GB272440 A GB 272440A GB 3270/27 A GB3270/27 A GB 3270/27A GB 327027 A GB327027 A GB 327027A GB 272440 A GB272440 A GB 272440A
Authority
GB
United Kingdom
Prior art keywords
core
salts
alkaline earth
metal
heated
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
GB3270/27A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB272440A publication Critical patent/GB272440A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

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

Abstract

272,440. Meyer, F., and Spanner, H. J. June 9, 1926, [Convention date]. Vacuum tubes.-A cathode is coated with one or more salts of highly electropositive metals such as alkali or alkaline earth metals with an amphoteric oxide which is less acid than titanic acid; aluminates, zincates, chromites, and zirconiates are suitable. The salts may be applied to a core heated by passage of current, or substances producing the salts may be used; for example, a mixture of a carbonate of an alkaline earth metal' with hydrated or anhydrous aluminium or zirconium oxide, and a binding material, such as fluorides of alkaline earth metals, may be applied to a core and heated. Other electron-emitting materials such as oxides, carbides, and sulphides may be added. A metal or alloy giving an amphoteric oxide upon oxidation may be used as the core or as a coating on a core of another metal.
GB3270/27A 1926-06-09 1927-02-04 Incandescent cathode for electric discharge tubes Expired GB272440A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE272440X 1926-06-09

Publications (1)

Publication Number Publication Date
GB272440A true GB272440A (en) 1928-04-26

Family

ID=6010243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3270/27A Expired GB272440A (en) 1926-06-09 1927-02-04 Incandescent cathode for electric discharge tubes

Country Status (4)

Country Link
US (2) US1817636A (en)
FR (1) FR657054A (en)
GB (1) GB272440A (en)
NL (1) NL24414C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974888C (en) * 1952-03-24 1961-05-25 Philips Nv Process for the manufacture of a cathode for electrical discharge tubes

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE486753A (en) * 1948-01-15
US2552654A (en) * 1948-08-30 1951-05-15 Rca Corp Heat-resistant cathode coatings
US2662196A (en) * 1948-11-04 1953-12-08 Western Union Telegraph Co Concentrated arc lamp
US2663816A (en) * 1949-09-28 1953-12-22 Sylvania Electric Prod Electric discharge lamp
US2605432A (en) * 1949-10-19 1952-07-29 Electrons Inc Indirectly heated cathode structure
US2845567A (en) * 1954-02-04 1958-07-29 Itt Indirectly heated thermionic cathode
BE545445A (en) * 1955-02-23
DE1035791B (en) * 1956-05-29 1958-08-07 Philips Nv Glow discharge tubes with an activated cold cathode and method for producing a tube provided with such a cathode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974888C (en) * 1952-03-24 1961-05-25 Philips Nv Process for the manufacture of a cathode for electrical discharge tubes

Also Published As

Publication number Publication date
FR657054A (en) 1929-05-16
US1925701A (en) 1933-09-05
NL24414C (en)
US1817636A (en) 1931-08-04

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