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.)
EDGAR ROEMHILD
Original Assignee
EDGAR ROEMHILD
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 EDGAR ROEMHILDfiledCriticalEDGAR ROEMHILD
Publication of GB296415ApublicationCriticalpatent/GB296415A/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
Landscapes
Electron Sources, Ion Sources
(AREA)
Microwave Tubes
(AREA)
GB25034/28A1927-08-311928-08-31Electron valve with indirectly heated cathode
ExpiredGB296415A
(en)
Tube à décharges électriques qui comporte une cathode à incandescence chauffée directement et qui est destiné à recevoir, amplifier ou engendrer des oscillations électriques