GB918089A - An improved cathode for electron tubes - Google Patents

An improved cathode for electron tubes

Info

Publication number
GB918089A
GB918089A GB1241461A GB1241461A GB918089A GB 918089 A GB918089 A GB 918089A GB 1241461 A GB1241461 A GB 1241461A GB 1241461 A GB1241461 A GB 1241461A GB 918089 A GB918089 A GB 918089A
Authority
GB
United Kingdom
Prior art keywords
sleeve
coating
seam
april
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
GB1241461A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB918089A publication Critical patent/GB918089A/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)

Abstract

918,089. Thermionic cathodes. SYLVANIA ELECTRIC PRODUCTS Inc. April 6, 1961 [April 29, 1960], No. 12414/61. Class 39 (1). An electron tube cathode has a wrap-around coating 25 of such a shape that the seam 31 formed by opposite edges follows a spiral of no more than one turn around the cathode sleeve 11. The coating 25 may comprise a cast film of calcium, barium and strontium carbonates in a cellulose binder, and may be applied to sleeve 11 by use of an adhesive, or by wetting the sleeve or coating with a solvent and using a puff of air to attach it to the sleeve or by the methods described in Specification 787,926. The use of a rhomboidal shaped wrap to obtain a spiral seam ensures that only a small portion of the seam is closely adjacent the grid wires 35.
GB1241461A 1960-04-29 1961-04-06 An improved cathode for electron tubes Expired GB918089A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2360160A 1960-04-29 1960-04-29

Publications (1)

Publication Number Publication Date
GB918089A true GB918089A (en) 1963-02-13

Family

ID=21816129

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1241461A Expired GB918089A (en) 1960-04-29 1961-04-06 An improved cathode for electron tubes

Country Status (1)

Country Link
GB (1) GB918089A (en)

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