GB650712A - Improvements in and relating to electric discharge devices - Google Patents

Improvements in and relating to electric discharge devices

Info

Publication number
GB650712A
GB650712A GB35226/46A GB3522646A GB650712A GB 650712 A GB650712 A GB 650712A GB 35226/46 A GB35226/46 A GB 35226/46A GB 3522646 A GB3522646 A GB 3522646A GB 650712 A GB650712 A GB 650712A
Authority
GB
United Kingdom
Prior art keywords
filaments
plate
pairs
class
electric discharge
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
GB35226/46A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 claimed from US475626A external-priority patent/US2399004A/en
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB650712A publication Critical patent/GB650712A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Electron Sources, Ion Sources (AREA)

Abstract

650,712. Thermionic valves. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 27, 1946, No. 35226. Convention date, Feb. 12, 1943. [Class 39 (i)] In an electric discharge device, the thermionic cathode consists of a plurality of filaments, each of which has been individually carbonized prior to welding them to an electrode mounting structure. The filaments are heated to a temperature of 2500‹ to 2700‹ C., and exposed to an atmosphere comprising a mixture of benzene and hydrogen for 20 to 60 seconds. After cooling filaments having substantially equal resistances are mounted to form the cathode. Hairpin annularly spaced filaments 12 are connected in pairs by elements 30 between two spaced plates 19, 20. The elements 30 are connected. to a third plate 29. The arrangement is such that the pairs of series connected filaments are energized in parallel. The plate 29 serves to equalize the potentials of the junctures between the pairs of series connected filaments. The looped ends of the filaments are held by hooks 39 supported on an anchor plate 40. A central spacing rod 41 acted upon by a spring 42 mounted on the plate 20, positions the anchor plate 40. In another embodiment a pair of oppositely wound helical filaments are bound at one end to a centre lead, and at their other end to separate leads by refractory wire. Specification 184,446, [Class 39 (i)], is referred to.
GB35226/46A 1943-02-12 1946-11-27 Improvements in and relating to electric discharge devices Expired GB650712A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US475626A US2399004A (en) 1943-02-12 1943-02-12 Electric discharge device and method of fabrication
US528906A US2399005A (en) 1943-02-12 1944-03-31 Method of fabricating electric discharge devices

Publications (1)

Publication Number Publication Date
GB650712A true GB650712A (en) 1951-02-28

Family

ID=27044873

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35226/46A Expired GB650712A (en) 1943-02-12 1946-11-27 Improvements in and relating to electric discharge devices

Country Status (3)

Country Link
US (1) US2399005A (en)
FR (1) FR967351A (en)
GB (1) GB650712A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563434A (en) * 1947-02-08 1951-08-07 Electron discharge tube assembly
US2695442A (en) * 1947-08-26 1954-11-30 Hartford Nat Bank & Trust Co Method of manufacturing electric discharge tubes
US2693546A (en) * 1948-07-10 1954-11-02 Eitel Mccullough Inc Electron emitter for electron tubes
US3172002A (en) * 1960-11-21 1965-03-02 Rca Corp Cathode mount and method of fabrication
US3483609A (en) * 1967-10-31 1969-12-16 Gen Electric Incandescent lamp manufacture

Also Published As

Publication number Publication date
US2399005A (en) 1946-04-23
FR967351A (en) 1950-11-02

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