Patents for H01J 21 - Vacuum tubes (739) |
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05/02/1989 | US4827177 Field emission vacuum devices |
03/08/1989 | EP0306173A1 Field emission devices |
08/25/1988 | WO1988006345A1 Very high speed integrated microelectronic tubes |
05/19/1988 | DE3639254A1 Electron tube for low power |
05/17/1988 | US4745324 High power switch tube with Faraday cage cavity anode |
03/16/1988 | EP0260075A2 Vacuum devices |
01/26/1988 | US4721885 Very high speed integrated microelectronic tubes |
12/16/1987 | EP0249324A2 High-power switch |
12/08/1987 | US4712039 Vacuum integrated circuit |
11/05/1986 | EP0200277A1 Electron tube |
12/17/1985 | US4559476 Radio-frequency amplifier |
09/25/1985 | EP0155464A1 High-power electron tube |
02/26/1985 | US4501990 Electron tube, especially transmitting tube, with a device for eliminating interfering retarding-field effects |
09/04/1984 | US4469982 Electron-beam tube |
10/18/1983 | US4410903 High frequency modulation; increased output currents and bandwidths; indium phosphide and indium gallium arsenide |
10/18/1983 | US4410832 Poison-resistant electrode; long lasting; lightweight |
12/28/1982 | CA1138519A1 High potential, low magnification electron gun |
10/19/1982 | US4355286 Resonant circuit arrangement |
09/21/1982 | US4350993 Heterojunction and Schottky barrier EBS targets |
03/04/1982 | WO1982000734A1 Electron-beam tube |
01/27/1982 | EP0044557A1 Electron tube of coaxial construction with cathode, grid and anode shaped as cylinder or cylinder shell, and with an equipment eliminating Bremsfeld oscillation disturbances |
11/24/1981 | US4302701 Directly heated cathode for an electron tube with coaxial electrode design |
10/13/1981 | US4295077 Circumferentially apertured cylindrical grid for electron tube |
07/07/1981 | US4277718 Modular electron tube with carbon grid |
04/08/1980 | US4197481 Magnetically focussed tube |
01/22/1980 | CA1070440A1 Electron beam collimator |
08/07/1979 | US4163949 Tubistor |
05/01/1979 | US4152621 Electron discharge device |
02/06/1979 | US4138622 High temperature electronic gain device |
09/19/1978 | US4115720 Device having thermionic cathode heated by field-emitted electrons |
08/15/1978 | US4107566 Rugged quick-heating electron tubes |
02/28/1978 | US4076992 Vacuum tube grid structures of phosmic bronze having copper and copper alloy conical supports |
11/22/1977 | US4059784 Electron-beam converter |
10/11/1977 | US4053808 Electron beam collimator |
03/08/1977 | US4011481 Modular electron discharge device |
11/30/1976 | US3995241 Device for attenuating very short parasitic waves in electronic tubes with coaxial, cylindrical electrodes |
08/31/1976 | US3978364 Integrated structure vacuum tube |
05/04/1976 | US3955114 Magnetically focused electron beam tube |
03/09/1976 | US3943398 Electronic tube with cylindrical electrodes |