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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP9253177ApriorityCriticalpatent/JPS5427351A/en
Publication of JPS5427351ApublicationCriticalpatent/JPS5427351A/en
PURPOSE: To maintain the electron radiation performance for a long time by forming the oxide layer to the substrate metal surface through heating in an atmosphere which oxidizes W or Mo before the decomposing process of the carbonate in the exhaustion process of the vacuum tube.
COPYRIGHT: (C)1979,JPO&Japio
JP9253177A1977-08-031977-08-03Manufacture of oxide cathode
PendingJPS5427351A
(en)