GB681230A - Improvements in and relating to methods of making electron emitting coatings - Google Patents

Improvements in and relating to methods of making electron emitting coatings

Info

Publication number
GB681230A
GB681230A GB14872/50A GB1487250A GB681230A GB 681230 A GB681230 A GB 681230A GB 14872/50 A GB14872/50 A GB 14872/50A GB 1487250 A GB1487250 A GB 1487250A GB 681230 A GB681230 A GB 681230A
Authority
GB
United Kingdom
Prior art keywords
parts
cathode
coating
carbonates
june
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
GB14872/50A
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
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB14872/50A priority Critical patent/GB681230A/en
Priority to FR1020434D priority patent/FR1020434A/en
Publication of GB681230A publication Critical patent/GB681230A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

681,230. Cathode materials and processing. BRITISH THOMSON-HOUSTON CO., Ltd. June 14, 1950 [June 25, 1949], No. 14872/50. Class 39(i) An electron-emitting coating composition comprises 100 parts by weight of at least one alkaline earth carbonate, 1-10 parts of a binder comprising a polymer of acrylic acid esters, vinyl acetate or styrene or mixtures thereof and 150-500 parts of solvent, the coating being subsequently heated to remove the polymer and convert the carbonate to oxide. Polymers or copolymers of methyl, ethyl, propyl, isopropyl, butyl or isobutyl methacrylate may be dissolved in benzine, toluene, nylene, or in diacetone or benzyl alcohol or in ethyl, anyl or butyl acetate in specified proportions, to which is added specified quantities of one or more carbonates of barium, strontium and calcium. The composition may be ball-milled screened and applied to the cathode by spraying, dipping or brushing. The coated cathode, when mounted in the tube, is activated by a surrounding furnace or by a heating current therethrough; decomposition of the resin into gases is completed at 350‹C whilst reduction of the carbonates commences at 825‹C whereby large pores in the coating are eliminated.
GB14872/50A 1950-06-14 1950-06-14 Improvements in and relating to methods of making electron emitting coatings Expired GB681230A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB14872/50A GB681230A (en) 1950-06-14 1950-06-14 Improvements in and relating to methods of making electron emitting coatings
FR1020434D FR1020434A (en) 1950-06-14 1950-06-16 Preparation of high electron emission coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14872/50A GB681230A (en) 1950-06-14 1950-06-14 Improvements in and relating to methods of making electron emitting coatings

Publications (1)

Publication Number Publication Date
GB681230A true GB681230A (en) 1952-10-22

Family

ID=40653410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14872/50A Expired GB681230A (en) 1950-06-14 1950-06-14 Improvements in and relating to methods of making electron emitting coatings

Country Status (2)

Country Link
FR (1) FR1020434A (en)
GB (1) GB681230A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068386B (en) * 1959-11-05
DE1146984B (en) * 1958-01-10 1963-04-11 Associated Electrical Ind Wool Device for the continuous production of an emission layer on a cathode for an electrical discharge device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE558297A (en) * 1956-06-14

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068386B (en) * 1959-11-05
DE1146984B (en) * 1958-01-10 1963-04-11 Associated Electrical Ind Wool Device for the continuous production of an emission layer on a cathode for an electrical discharge device

Also Published As

Publication number Publication date
FR1020434A (en) 1953-02-06

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