Patents for H01J 19 - Details of vacuum tubes of the types covered by group (1,326) |
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09/19/1978 | US4115720 Device having thermionic cathode heated by field-emitted electrons |
08/15/1978 | US4107566 Rugged quick-heating electron tubes |
06/20/1978 | US4096406 Thermionic electron source with bonded control grid |
02/28/1978 | US4076992 Vacuum tube grid structures of phosmic bronze having copper and copper alloy conical supports |
02/28/1978 | US4076366 High voltage electron tube base with separate dielectric fill-hole |
11/29/1977 | US4060747 Phototube having domed mesh with non-uniform apertures |
09/06/1977 | USRE29390 Electric discharge tube, comprising a highly loaded anode |
08/09/1977 | US4040708 Cathode ray tube base |
07/05/1977 | US4034258 Device for attenuating very short parasitic waves in electronic tubes |
07/05/1977 | US4034031 Method of manufacturing grid electrodes for electron tubes |
04/19/1977 | US4019079 Gas injected vacuum switch |
04/12/1977 | US4017760 Parasitic oscillation suppressor for electronic tubes |
01/11/1977 | US4002943 Tunable microwave cavity |
01/11/1977 | US4002884 Heater element for an indirectly heated cathode |
11/30/1976 | US3995188 Grid for an electronic tube |
09/07/1976 | US3979157 Electron tube base |
08/24/1976 | US3976909 Wire mesh cathode |
07/27/1976 | US3971964 Cylindric grid electrode structure for electronic tubes comprising carbon filaments coated with pyrolytic graphite |
07/20/1976 | US3970971 Parasitic wave attenuator useable in high frequency electronic tubes |
07/20/1976 | US3970768 Grid electrodes |
06/29/1976 | US3967150 Grid controlled electron source and method of making same |
05/25/1976 | US3958854 Spark gap apparatus |
05/04/1976 | US3955114 Magnetically focused electron beam tube |
03/09/1976 | US3943398 Electronic tube with cylindrical electrodes |
02/03/1976 | US3936691 Color cathode ray tube frame-color selection electrode support structure |
01/20/1976 | US3934168 Grid support means for a planar tube |