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.)
Expired
Application number
GB10820/38A
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
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 Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Publication of GB489923ApublicationCriticalpatent/GB489923A/en
489,923. Electron multipliers. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. June 19, 1937, No. 10820/38. Convention date, June 22, 1936. Divided application. [Class 39 (i)] A discharge tube contains a thermionic cathode, one or more grids, an anode and a secondary-electron-emitting electrode which in operating conditions attains a temperature of 500‹ C. or more. The " poisoning " of the secondary emitter by barium evaporated from the thermionic cathode is prevented. The secondary emitter may comprise barium oxide.
GB10820/38A1936-06-221937-06-19Improvements in or relating to electric discharge tubes
ExpiredGB489923A
(en)