GB714429A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB714429A
GB714429A GB1684051A GB1684051A GB714429A GB 714429 A GB714429 A GB 714429A GB 1684051 A GB1684051 A GB 1684051A GB 1684051 A GB1684051 A GB 1684051A GB 714429 A GB714429 A GB 714429A
Authority
GB
United Kingdom
Prior art keywords
alkaline earth
mixed
july
cathode
oxide
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
GB1684051A
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.)
EDWARD GEORGE STEWARD
HAROLD PERCY ROOKSBY
JAMES NORMAN BOWTELL
General Electric Co PLC
Original Assignee
EDWARD GEORGE STEWARD
HAROLD PERCY ROOKSBY
JAMES NORMAN BOWTELL
General Electric Co PLC
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 EDWARD GEORGE STEWARD, HAROLD PERCY ROOKSBY, JAMES NORMAN BOWTELL, General Electric Co PLC filed Critical EDWARD GEORGE STEWARD
Priority to GB1684051A priority Critical patent/GB714429A/en
Priority to FR1060976D priority patent/FR1060976A/en
Publication of GB714429A publication Critical patent/GB714429A/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)

Abstract

714,429. Electrode materials and processing. GENERAL ELECTRIC CO., Ltd., BOWTELL, J. N., MILES, E. E., ROOKSBY, H. P., and STEWARD, E. G. July 10, 1952 [July 16, 1951; July 25, 1951], Nos. 16840/51 and 17631/51. Class 39(1) A thermionic cathode for a gas or vapour discharge tube has electron emissive material which consists wholly or mainly of a mixture of one or more alkaline earth oxides with one or more alkaline earth tungstates of the formula X 3 WO 6 where X is one or more of the alkaline earth metals. The tungstate may be mixed with the alkaline earth oxide or powdered tungsten or tungsten oxide of grain size ¢ to 5 microns is mixed with alkaline earth compounds, e.g. carbonates, and heated to 1300‹C during the processing of the tube. Barium or strontium oxides separately or mixed is preferred; not more than 10 per cent of calcium oxide may be used. The material mixed with gum tragacanth is shaped into pellets for enclosure within the cathode or a suspension thereof may be dipped, painted or sprayed on to the cathode, e.g. a coiled coil filament for a fluorescent discharge lamp.
GB1684051A 1951-07-16 1951-07-16 Improvements in or relating to thermionic cathodes Expired GB714429A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1684051A GB714429A (en) 1951-07-16 1951-07-16 Improvements in or relating to thermionic cathodes
FR1060976D FR1060976A (en) 1951-07-16 1952-07-16 Thermionic cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1684051A GB714429A (en) 1951-07-16 1951-07-16 Improvements in or relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB714429A true GB714429A (en) 1954-08-25

Family

ID=10084624

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1684051A Expired GB714429A (en) 1951-07-16 1951-07-16 Improvements in or relating to thermionic cathodes

Country Status (2)

Country Link
FR (1) FR1060976A (en)
GB (1) GB714429A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1057231B (en) * 1956-03-03 1959-05-14 Patra Patent Treuhand Activated glow electrode for electric discharge lamps
DE1183172B (en) * 1961-01-26 1964-12-10 Philips Nv Low pressure discharge lamp
FR2438338A1 (en) * 1978-10-06 1980-04-30 Philips Nv HIGH PRESSURE SODIUM STEAM DISCHARGE LAMP

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1057231B (en) * 1956-03-03 1959-05-14 Patra Patent Treuhand Activated glow electrode for electric discharge lamps
DE1183172B (en) * 1961-01-26 1964-12-10 Philips Nv Low pressure discharge lamp
FR2438338A1 (en) * 1978-10-06 1980-04-30 Philips Nv HIGH PRESSURE SODIUM STEAM DISCHARGE LAMP
US4322654A (en) * 1978-10-06 1982-03-30 U.S. Philips Corporation High-pressure sodium vapor discharge lamp

Also Published As

Publication number Publication date
FR1060976A (en) 1954-04-07

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