GB617879A - Improvements in and relating to thermionic cathodes - Google Patents

Improvements in and relating to thermionic cathodes

Info

Publication number
GB617879A
GB617879A GB2542945A GB2542945A GB617879A GB 617879 A GB617879 A GB 617879A GB 2542945 A GB2542945 A GB 2542945A GB 2542945 A GB2542945 A GB 2542945A GB 617879 A GB617879 A GB 617879A
Authority
GB
United Kingdom
Prior art keywords
alumina
oxide
thermionic cathodes
solution
suspension
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
GB2542945A
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.)
RONALD OSMOND JENKINS
MO Valve Co Ltd
Original Assignee
RONALD OSMOND JENKINS
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 RONALD OSMOND JENKINS, MO Valve Co Ltd filed Critical RONALD OSMOND JENKINS
Priority to GB2542945A priority Critical patent/GB617879A/en
Publication of GB617879A publication Critical patent/GB617879A/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
    • H01J9/08—Manufacture of heaters for indirectly-heated cathodes

Abstract

617,879. Electrophoretic deposition of alumina on thermionic cathodes. M-O VALVE CO., Ltd., and JENKINS, R. O. Oct. 1, 1945, No. 25429. [Class 41] In the manufacture of thermionic cathodes, alumina is deposited upon the heater, e.g. a wire, by electrophoresis from a suspension of the oxide in a liquid comprising an aqueous electrolytic solution and a solution of a suitable binder which is subsequently removed from the deposit by heating. The oxide may be suspended in a nitrocellulose solution which contains substantial quantities of a diluent such as acetone or methyl alcohol to which is added a small quantity of the aqueous electrolytic solution such as sodium chloride in water for activating the particles of oxide by ion absorption. Small additions of other oxides, e.g. beryllia may be made to the alumina in suspension. The heater wire is passed axially through a cylindrical cathode made up of nickel wires. Specifications 531,522 and 587,039 are referred to.
GB2542945A 1945-10-01 1945-10-01 Improvements in and relating to thermionic cathodes Expired GB617879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2542945A GB617879A (en) 1945-10-01 1945-10-01 Improvements in and relating to thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2542945A GB617879A (en) 1945-10-01 1945-10-01 Improvements in and relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB617879A true GB617879A (en) 1949-02-14

Family

ID=10227522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2542945A Expired GB617879A (en) 1945-10-01 1945-10-01 Improvements in and relating to thermionic cathodes

Country Status (1)

Country Link
GB (1) GB617879A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924738A1 (en) * 1997-12-19 1999-06-23 Matsushita Electronics Corporation Methods of manufacturing heater and cathode-ray tube comprising the same
US6242854B1 (en) 1998-01-20 2001-06-05 Matsushita Electronics Corporation Indirectly heated cathode for a CRT having high purity alumina insulating layer with limited amounts of Na OR Si

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924738A1 (en) * 1997-12-19 1999-06-23 Matsushita Electronics Corporation Methods of manufacturing heater and cathode-ray tube comprising the same
US6294065B1 (en) 1997-12-19 2001-09-25 Matsushita Electric Industrial Co., Ltd. Methods of manufacturing heater and cathode-ray tube comprising the same
US6242854B1 (en) 1998-01-20 2001-06-05 Matsushita Electronics Corporation Indirectly heated cathode for a CRT having high purity alumina insulating layer with limited amounts of Na OR Si

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