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.)
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Compagnie des Lampes
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Compagnie des Lampes
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Filing date
Publication date
Application filed by Compagnie des LampesfiledCriticalCompagnie des Lampes
Application grantedgrantedCritical
Publication of FR37508EpublicationCriticalpatent/FR37508E/en
H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
H01J1/02—Main electrodes
H01J1/13—Solid thermionic cathodes
H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
H01J1/24—Insulating layer or body located between heater and emissive material
FR37508D1929-10-151929-10-15
Improvements to coated electrode manufacturing processes
ExpiredFR37508E
(en)