GB582729A - Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices - Google Patents

Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices

Info

Publication number
GB582729A
GB582729A GB377944A GB377944A GB582729A GB 582729 A GB582729 A GB 582729A GB 377944 A GB377944 A GB 377944A GB 377944 A GB377944 A GB 377944A GB 582729 A GB582729 A GB 582729A
Authority
GB
United Kingdom
Prior art keywords
cathodes
relating
applying
methods
weight
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
GB377944A
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.)
JAN ADOLPH MARIA VAN MOLL
Mullard Radio Valve Co Ltd
Original Assignee
JAN ADOLPH MARIA VAN MOLL
Mullard Radio 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
Priority to FR957377D priority Critical patent/FR957377A/fr
Priority to BE478458D priority patent/BE478458A/xx
Application filed by JAN ADOLPH MARIA VAN MOLL, Mullard Radio Valve Co Ltd filed Critical JAN ADOLPH MARIA VAN MOLL
Priority to GB377944A priority patent/GB582729A/en
Publication of GB582729A publication Critical patent/GB582729A/en
Priority to DEP26557A priority patent/DE854061C/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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paints Or Removers (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A coating composition for the cathode of an electron discharge device comprises a suspension of an electron emissive material in powder form in a solution of polyvinyl acetate in an organic solvent chosen from ketones, alcohols, esters, or hydrocarbons, or in a mixture of such solvents, and is applied by spraying. The coating is dried to remove the solvents of the binder, and after the device has been evacuated and sealed it is heated to decompose the polyvinyl acetate. An example of a coating composition is given as a suspension of 30 parts by weight of barium carbonate in a solution of one part by weight of polyvinyl acetate in 40 parts by weight of a mixture of equal parts of amyl acetate and methyl alcohol. Specification 275,542, [Class 39 (i), and U.S.A. Specification 1,828,545 are referred to.
GB377944A 1944-02-29 1944-02-29 Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices Expired GB582729A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR957377D FR957377A (en) 1944-02-29
BE478458D BE478458A (en) 1944-02-29
GB377944A GB582729A (en) 1944-02-29 1944-02-29 Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices
DEP26557A DE854061C (en) 1944-02-29 1948-12-24 Process for the production of oxide cathodes for electrical discharge tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB377944A GB582729A (en) 1944-02-29 1944-02-29 Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices

Publications (1)

Publication Number Publication Date
GB582729A true GB582729A (en) 1946-11-26

Family

ID=9764762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB377944A Expired GB582729A (en) 1944-02-29 1944-02-29 Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices

Country Status (4)

Country Link
BE (1) BE478458A (en)
DE (1) DE854061C (en)
FR (1) FR957377A (en)
GB (1) GB582729A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744838A (en) * 1951-11-03 1956-05-08 Gen Electric Electron discharge device cathode and method of making same
DE1002475B (en) * 1953-12-22 1957-02-14 Loewe Opta Ag Process for the production of emission layers for cathodes
DE1007891B (en) * 1954-01-09 1957-05-09 Telefunken Gmbh Process for the production of grids provided with carbon black or graphite for electron tubes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1640710A (en) * 1926-03-01 1927-08-30 Hazeltine Corp Electron emitting cathode and process of preparing the same
FR696397A (en) * 1926-08-06 1930-12-30 Radiowerk E Schrack Method of producing oxidized cathodes for high intensity emission electron tubes
US1828545A (en) * 1927-08-26 1931-10-20 Ruben Tube Company Vacuum tube and its elements
US2311513A (en) * 1940-01-17 1943-02-16 Westinghouse Electric & Mfg Co Method of applying luminescent coating
US2297048A (en) * 1940-03-12 1942-09-29 Gen Electric Luminescent coating

Also Published As

Publication number Publication date
FR957377A (en) 1950-02-18
BE478458A (en)
DE854061C (en) 1952-10-30

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