GB419096A - Improvements in thermionic cathodes - Google Patents

Improvements in thermionic cathodes

Info

Publication number
GB419096A
GB419096A GB18051/33A GB1805133A GB419096A GB 419096 A GB419096 A GB 419096A GB 18051/33 A GB18051/33 A GB 18051/33A GB 1805133 A GB1805133 A GB 1805133A GB 419096 A GB419096 A GB 419096A
Authority
GB
United Kingdom
Prior art keywords
spiral
coating
class
diameter
cathode
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
GB18051/33A
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.)
MO Valve Co Ltd
Original Assignee
MO 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 BE403333D priority Critical patent/BE403333A/xx
Priority to NL38569D priority patent/NL38569C/xx
Application filed by MO Valve Co Ltd filed Critical MO Valve Co Ltd
Priority to GB18051/33A priority patent/GB419096A/en
Priority to FR772609D priority patent/FR772609A/en
Priority to US728062A priority patent/US2014787A/en
Publication of GB419096A publication Critical patent/GB419096A/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

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

419,096. Thermionic valves. M.O. VALVE CO., Ltd., Electra House, Victoria Embankment, London, SMITHELLS, C. J., and TRELOAR, L. R. G., c/o General Electric Co., Wembley, Middlesex. June 24, 1933, No. 18051. [Class 39 (i).] An indirectly heated cathode is formed by coating a tungsten wire 1 of 0.1 m.m. diameter with a layer of alumina 0.1 to 0.2 m.m. thick, winding thereon a spiral of nickel wire 0.1 m.m. diameter and spraying on the spiral a coating of barium and strontium carbonates which coating is afterwards converted to the oxides ; the turns of the spiral are kept apart and after an appropriate length has been cut off a manufactured length, the structure is doubled as shown so that the magnetic fields of adjacent branches compensate each other. The earthed leads 5 are connected to the ends and middle of the cathode. Specifications 209,415, 278,787, 281,262, [all in Class 39 (i)], 360,715, 371,419, and 379,334 are referred to.
GB18051/33A 1933-06-24 1933-06-24 Improvements in thermionic cathodes Expired GB419096A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE403333D BE403333A (en) 1933-06-24
NL38569D NL38569C (en) 1933-06-24
GB18051/33A GB419096A (en) 1933-06-24 1933-06-24 Improvements in thermionic cathodes
FR772609D FR772609A (en) 1933-06-24 1934-04-30 Indirectly heated elongated cathode for thermionic tubes
US728062A US2014787A (en) 1933-06-24 1934-05-29 Thermionic cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18051/33A GB419096A (en) 1933-06-24 1933-06-24 Improvements in thermionic cathodes

Publications (1)

Publication Number Publication Date
GB419096A true GB419096A (en) 1934-11-06

Family

ID=10105780

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18051/33A Expired GB419096A (en) 1933-06-24 1933-06-24 Improvements in thermionic cathodes

Country Status (5)

Country Link
US (1) US2014787A (en)
BE (1) BE403333A (en)
FR (1) FR772609A (en)
GB (1) GB419096A (en)
NL (1) NL38569C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589521A (en) * 1952-03-18 Heater
US2589522A (en) * 1952-03-18 Cathode heater structure
BE478149A (en) * 1946-11-13
US2653268A (en) * 1950-05-01 1953-09-22 Beverly D Kumpfer Directly heated cathode structure
GB734196A (en) * 1952-06-11 1955-07-27 Standard Telephones Cables Ltd Improvements in or relating to indirectly heated cathodes
US2872611A (en) * 1953-11-16 1959-02-03 Sylvania Electric Prod Cathode
US3226806A (en) * 1960-03-18 1966-01-04 Eitel Mccullough Inc Method of making a cathode heater assembly
NL268393A (en) * 1960-08-19
EP1983546A1 (en) * 2007-04-20 2008-10-22 PANalytical B.V. X-ray cathode and tube

Also Published As

Publication number Publication date
NL38569C (en)
FR772609A (en) 1934-11-02
BE403333A (en)
US2014787A (en) 1935-09-17

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