GB688960A - Improvements in or relating to methods of preparing grids for electric discharge tubes - Google Patents

Improvements in or relating to methods of preparing grids for electric discharge tubes

Info

Publication number
GB688960A
GB688960A GB23823/51A GB2382351A GB688960A GB 688960 A GB688960 A GB 688960A GB 23823/51 A GB23823/51 A GB 23823/51A GB 2382351 A GB2382351 A GB 2382351A GB 688960 A GB688960 A GB 688960A
Authority
GB
United Kingdom
Prior art keywords
grid
relating
methods
electric discharge
oct
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
GB23823/51A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB688960A publication Critical patent/GB688960A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

688,960. Electrode materials and processing. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Oct. 12, 1951 [Oct. 17, 1950], No. 23823/51. Drawings to Specification. Class 39(i) To facilitate adjustment of the secondaryemission from a platinum coated molybdenum grid of a thermionic valve, e.g. a transmitting valve, the carbonised tungsten-thorium incandescent cathode is heated, e.g. nearly to the melting point of tungsten, so that carbon therefrom is deposited on the grid. A black platinum coating, one micron thick may be produced on the grid wire electrolytically, and annealed at 900‹C in hydrogen until the colour is grey. The grid may subsequently be heated to adjust its secondary emission.
GB23823/51A 1950-10-17 1951-10-12 Improvements in or relating to methods of preparing grids for electric discharge tubes Expired GB688960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL688960X 1950-10-17

Publications (1)

Publication Number Publication Date
GB688960A true GB688960A (en) 1953-03-18

Family

ID=19805750

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23823/51A Expired GB688960A (en) 1950-10-17 1951-10-12 Improvements in or relating to methods of preparing grids for electric discharge tubes

Country Status (1)

Country Link
GB (1) GB688960A (en)

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