GB487257A - Improvements in thermionic valves with filamentary cathodes - Google Patents

Improvements in thermionic valves with filamentary cathodes

Info

Publication number
GB487257A
GB487257A GB306437A GB306437A GB487257A GB 487257 A GB487257 A GB 487257A GB 306437 A GB306437 A GB 306437A GB 306437 A GB306437 A GB 306437A GB 487257 A GB487257 A GB 487257A
Authority
GB
United Kingdom
Prior art keywords
plate
thermionic valves
filamentary
class
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
GB306437A
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
Application filed by MO Valve Co Ltd filed Critical MO Valve Co Ltd
Priority to GB306437A priority Critical patent/GB487257A/en
Publication of GB487257A publication Critical patent/GB487257A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0002—Construction arrangements of electrode systems

Landscapes

  • Discharge Lamp (AREA)

Abstract

487,257. Thermionic valves. M-O VALVE CO., Ltd., and SMITHELLS, C. J. Feb. 2, 1937, No. 3064. [Class 39 (i)] In thermionic valves having a filamentary cathode adapted to operate at a temperature not exceeding 1500‹ C., e.g. an oxide-coated filament, the filament is supported substantially along the whole of its active length by a plate of insulating material on one side of which it rests and which carries on the same side at least one of the electrodes with which it co-operates. As shown a helical filamentary oxide-coated cathode 9 lies between ridges on a steatite plate 2 supported in an approximately cylindrical bulb 1 by the leading in wires 3, 4, 5, 6 passing through a ring seal 7. The grid 10 and anode 11 are both cylindrical and are fixed by tags entering holes in the plate 1. Specification 290,355, [Class 39 (i)], is referred to.
GB306437A 1937-02-02 1937-02-02 Improvements in thermionic valves with filamentary cathodes Expired GB487257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB306437A GB487257A (en) 1937-02-02 1937-02-02 Improvements in thermionic valves with filamentary cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB306437A GB487257A (en) 1937-02-02 1937-02-02 Improvements in thermionic valves with filamentary cathodes

Publications (1)

Publication Number Publication Date
GB487257A true GB487257A (en) 1938-06-17

Family

ID=9751302

Family Applications (1)

Application Number Title Priority Date Filing Date
GB306437A Expired GB487257A (en) 1937-02-02 1937-02-02 Improvements in thermionic valves with filamentary cathodes

Country Status (1)

Country Link
GB (1) GB487257A (en)

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