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