GB315295A - Improvements relating to thermionic valves or electron discharge tubes - Google Patents

Improvements relating to thermionic valves or electron discharge tubes

Info

Publication number
GB315295A
GB315295A GB30194/28A GB3019428A GB315295A GB 315295 A GB315295 A GB 315295A GB 30194/28 A GB30194/28 A GB 30194/28A GB 3019428 A GB3019428 A GB 3019428A GB 315295 A GB315295 A GB 315295A
Authority
GB
United Kingdom
Prior art keywords
oxide
insulator
heater
improvements relating
discharge tubes
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
GB30194/28A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB315295A publication Critical patent/GB315295A/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
    • H01J1/24—Insulating layer or body located between heater and emissive material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

315,295. Naamlooze Vennootschap Philips' Gloeilampenfabrieken. July 11, 1928, [Convention date]. Vacuum tubes.-An indirectly-heated cathode has an insulating body consisting of a mixture of silica and another refractory oxide such as alumina inserted between the heater and the cathode; small quantities of iron oxide and manganese oxide may be added. The heater may consist of a tungsten wire or filament and the insulator may be applied by spraying. The electron-emitting surface, such as an alkaline earth metal or oxide, may be applied directly to the insulator or to an intermediate layer of metal, such as a seamless nickel tube. Barium may be set free from barium oxide applied to the surface of the anode.
GB30194/28A 1928-07-11 1928-10-18 Improvements relating to thermionic valves or electron discharge tubes Expired GB315295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL315295X 1928-07-11

Publications (1)

Publication Number Publication Date
GB315295A true GB315295A (en) 1929-10-10

Family

ID=19783781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30194/28A Expired GB315295A (en) 1928-07-11 1928-10-18 Improvements relating to thermionic valves or electron discharge tubes

Country Status (2)

Country Link
FR (1) FR676120A (en)
GB (1) GB315295A (en)

Also Published As

Publication number Publication date
FR676120A (en) 1930-02-19

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