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
GB8404/37A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Publication of GB484748ApublicationCriticalpatent/GB484748A/en
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
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(AREA)
Abstract
484,748. Electrode materials. NAAMLOOZE VENNOOTSCHAP PHILIPS'GLOEILAMPENFABRIEKEN. March 22, 1937, No. 8404. Convention date, March 24, 1936. [Class 39 (i)] An electric discharge tube comprises an oxide cathode and one or more metallic electrodes, in which the metallic surface of one or more of these electrodes is at least partly coated with a layer of soot directly precipitated thereon from the atmosphere surrounding a flame. The coated surfaces are preferably those that can be struck by barium vaporizing from the cathode, particularly the portion, e.g. of the anode, facing the cathode. The soot layer may be produced by holding the surface of the electrode above burning turpentine.
GB8404/37A1936-03-241937-03-22Improvements in electric discharge tubes
ExpiredGB484748A
(en)