GB282205A - Improvements in or relating to electric discharge tubes - Google Patents

Improvements in or relating to electric discharge tubes

Info

Publication number
GB282205A
GB282205A GB29828/26A GB2982826A GB282205A GB 282205 A GB282205 A GB 282205A GB 29828/26 A GB29828/26 A GB 29828/26A GB 2982826 A GB2982826 A GB 2982826A GB 282205 A GB282205 A GB 282205A
Authority
GB
United Kingdom
Prior art keywords
electrode
coated
nickel
metal
compound
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
GB29828/26A
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 GB29828/26A priority Critical patent/GB282205A/en
Priority to FR643704D priority patent/FR643704A/en
Priority to US234030A priority patent/US1809229A/en
Publication of GB282205A publication Critical patent/GB282205A/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
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

282,205. M-O Valve Co., Ltd., Bartlett, A. C., and Ryde, J. W. Nov. 25. 1926. Vacuum tubes.-A cathode for a gas discharge tube, such as a biphase rectifier, consists of a metal containing nickel or iron coated with a compound of an alkaline earth metal such as barium nitrate, and subjected to heat treatment whereby a compound of alkaline earth metal and the metal of the electrode is formed which enables the running potential to be lower than that of the uncoated electrode. In the preferred process a nickel electrode is coated with moistened barium nitrate and dried. The coated electrode is heated in a vacuum furnace or in air to 750‹ C. for half-an-hour and then cooled. During the heating stage the nitrate reacts with nickel and changes to a reddish-brown colour. A coating which is black and crystalline, or leadgrey or white is unsuitable. The electrode may be exposed to air without adverse effect. A biphase rectifier has a single cathode and two anodes.
GB29828/26A 1926-11-25 1926-11-25 Improvements in or relating to electric discharge tubes Expired GB282205A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB29828/26A GB282205A (en) 1926-11-25 1926-11-25 Improvements in or relating to electric discharge tubes
FR643704D FR643704A (en) 1926-11-25 1927-11-09 Manufacturing process of coated cathodes
US234030A US1809229A (en) 1926-11-25 1927-11-17 Electric discharge tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29828/26A GB282205A (en) 1926-11-25 1926-11-25 Improvements in or relating to electric discharge tubes

Publications (1)

Publication Number Publication Date
GB282205A true GB282205A (en) 1927-12-22

Family

ID=10297834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29828/26A Expired GB282205A (en) 1926-11-25 1926-11-25 Improvements in or relating to electric discharge tubes

Country Status (3)

Country Link
US (1) US1809229A (en)
FR (1) FR643704A (en)
GB (1) GB282205A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677623A (en) * 1949-10-27 1954-05-04 Ets Claude Paz & Silva Process for manufacturing electron emissive material and electrodes
US2631945A (en) * 1949-11-19 1953-03-17 Bell Telephone Labor Inc Cold cathode and method of preparing same
US2686735A (en) * 1951-01-03 1954-08-17 Rca Corp Cathode material
NO149825C (en) * 1981-12-30 1984-06-27 Oskar Hovde CLOTHING FOR THE WALL

Also Published As

Publication number Publication date
FR643704A (en) 1928-09-21
US1809229A (en) 1931-06-09

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