FR989714A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements in the manufacture of vacuum tubes, and more particularly of electronic lamps with several electrodes
Assignee: Societe Francaise Radio Electrique
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Filing: 1944-03-03
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Granted: 1951-09-12
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Expires: 1964-03-03
Abstract
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Inventors
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Bibliographic Details
Application Number
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Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/24; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0038; H01J2893/0039
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