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
GB19246/54A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products IncfiledCriticalSylvania Electric Products Inc
Publication of GB766829ApublicationCriticalpatent/GB766829A/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
Solid Thermionic Cathode
(AREA)
Abstract
766,829. Cathode materials and processing. SYLVANIA ELECTRIC PRODUCTS, Inc. June 30, 1954 [July 6, 1953], No. 19246/54. Class 39(1). A thermionic cathode has an underlying smooth dense coating 28 of oxide, and an outer layer 42, fluffy and less dense, of the same material. In an example, a filament wire of 0À00045 in. diameter is coated, electrophoretically or by spraying, with a layer of the usual carbonates, about 0À001 in. thick, and density 1-3 gm./cc. A further sprayed layer is then applied, of density about 0À4 to 0À5 gm./cc., and 0À0015 in. thick. Indirectly heated cathodes may be similarly prepared.
GB19246/54A1953-07-061954-06-30Multiple density oxide coated cathodes and filament wire
ExpiredGB766829A
(en)
Improvements in or relating to methods of coating a filament for an indirectly - heated cathode with a black - radiating insudirectly - heated cathode with a black - radiating insulating layer, cathodes comprising such a filament and electric dicharge tubes provided with such a cathode