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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PAUL HINSTIN ET ARMAND LEHMANN
Original Assignee
PAUL HINSTIN ET ARMAND LEHMANN
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Filing date
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Application filed by PAUL HINSTIN ET ARMAND LEHMANNfiledCriticalPAUL HINSTIN ET ARMAND LEHMANN
Application grantedgrantedCritical
Publication of FR629551ApublicationCriticalpatent/FR629551A/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
H01J1/30—Cold cathodes, e.g. field-emissive cathode
FR629551D1926-05-061926-05-06
Improvements to vacuum tubes
ExpiredFR629551A
(en)