GB790439A - Improvements in the production of oxide cathode filaments - Google Patents

Improvements in the production of oxide cathode filaments

Info

Publication number
GB790439A
GB790439A GB21718/55A GB2171855A GB790439A GB 790439 A GB790439 A GB 790439A GB 21718/55 A GB21718/55 A GB 21718/55A GB 2171855 A GB2171855 A GB 2171855A GB 790439 A GB790439 A GB 790439A
Authority
GB
United Kingdom
Prior art keywords
filament
resistance
desired value
bath
resistor
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
GB21718/55A
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.)
Egyesuelt Izzolampa es Villamossagi Rt
Original Assignee
Egyesuelt Izzolampa es Villamossagi Rt
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 Egyesuelt Izzolampa es Villamossagi Rt filed Critical Egyesuelt Izzolampa es Villamossagi Rt
Publication of GB790439A publication Critical patent/GB790439A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

790,439. Automatic resistance control systems. EGYESULT IZZOLAMPA ES VILLAMOSSAGI R.T. July 27, 1955 [July 27, 1954], No. 21718/55. Class 38 (4). [Also in Group XXXVI] Tungsten filaments for oxide cathodes are electrolytically polished before oxidation, the polishing current being varied with the resistance of a fixed length of filament issuing from the electrolytic bath, whereby the resistance per unit length of the filament is maintained at a desired value. A section 7 of the filament issuing from the bath 4, having the filament as anode, is connected between fixed contacts 5, 6 in a bridge network 8 comprising a fixed resistor 14 and a datum-setting resistor 13. The bridge is supplied from a D.C. source 9 and has its output applied in the grid circuit of a valve 10 having the bath 4 in its anode circuit with an H.T. supply 11, whereby deviations of the resistance of the section 7 from a desired value, set by the tapping on resistor 13, cause corrective variations in the polishing current so that the resistance of the filament is maintained at the desired value. A multi-stage amplifier may replace the single valve.
GB21718/55A 1954-07-27 1955-07-27 Improvements in the production of oxide cathode filaments Expired GB790439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU790439X 1954-07-27

Publications (1)

Publication Number Publication Date
GB790439A true GB790439A (en) 1958-02-12

Family

ID=10980332

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21718/55A Expired GB790439A (en) 1954-07-27 1955-07-27 Improvements in the production of oxide cathode filaments

Country Status (1)

Country Link
GB (1) GB790439A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001035434A1 (en) * 1999-11-12 2001-05-17 Universite Claude Bernard Lyon I Method for producing an emitting cathode using sol-gel technique and resulting cathode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001035434A1 (en) * 1999-11-12 2001-05-17 Universite Claude Bernard Lyon I Method for producing an emitting cathode using sol-gel technique and resulting cathode
FR2801135A1 (en) * 1999-11-12 2001-05-18 Univ Claude Bernard Lyon PROCESS FOR PRODUCING A TRANSMISSION CATHODE USING THE SOL-GEL TECHNIQUE AND CATHODE OBTAINED BY SUCH A METHOD

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