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.)
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
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Filing date
Publication date
Publication of ES194869A1publicationCriticalpatent/ES194869A1/es
Application filed by Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
229910000287alkaline earth metal oxideInorganic materials0.000abstract1
Landscapes
Discharge Lamp
(AREA)
Abstract
Un tubo de descarga provisto de un cátodo activado con ayuda de óxidos de metales alcalinotérreos caracterizado por el hecho de que por lo menos una rejilla o el ánodo o una y otro están constituídos por lo menos superficialmente por una delgada capa de torio en estado oxidado.
ES0194869A1949-10-101952-10-07UN TUBO DE DESCARGA QUE TIENE UN CáTODO ACTIVADO CON AYUDA DE oXIDOS DE METALES ALCALINOTÉRREOS
ExpiredES194869A1
(es)
Improvements in or relating toan amplifier circuit having variable amplification and comprising atleast one tube containing an auxiliary cathode emitting secondary electrons