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
GB3489335A
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.)
CHRISTOPHER EVELYN FENWICK
British Thomson Houston Co Ltd
Original Assignee
CHRISTOPHER EVELYN FENWICK
British Thomson Houston Co 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 CHRISTOPHER EVELYN FENWICK, British Thomson Houston Co LtdfiledCriticalCHRISTOPHER EVELYN FENWICK
Priority to GB3489335ApriorityCriticalpatent/GB467432A/en
Publication of GB467432ApublicationCriticalpatent/GB467432A/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
Landscapes
Lasers
(AREA)
Abstract
467,432. Thermionic cathodes. BRITISH THOMSON-HOUSTON CO., Ltd., RULE, W., FENWICK, C. E., and SCOTT, W. J. Dec. 16, 1935, No. 34893. [Class 39 (i)] In pellet-form cathodes for use in lamps, the pellet has a central aperture 2, and, it may be, a number of parallel apertures 3, passing through it to facilitate degassing. The tungsten or like wire heater surrounding the pellet is formed as a spiral at the upper face, the wire passing through the central aperture either as a single strand or as a helix of the same diameter as the aperture.
GB3489335A1935-12-161935-12-16Improvements in and relating to electric discharge devices
ExpiredGB467432A
(en)
Improved improvements in the manufacture of compact source mercury vapor discharge lamps (Machine-translation by Google Translate, not legally binding)