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Class Information
Number: 331/86
Name: Oscillators > With magnetically controlled space discharge device (e.g., magnetron)
Description: Subject matter wherein the active element of the oscillator consists of a space discharge device having means for producing a space discharge comprising charged particles, such as electrons or ions, and wherein further means are provided for subjecting the space discharge to the direct control of a magnetic field and an electric field.

Sub-classes under this class:

Class Number Class Name Patents
331/90 With frequency adjustment 38
331/88 With frequency stabilization 16
331/87 With particular pulsing means 26
331/89 With secondary emissive electrode 3
331/91 With undesired mode suppression or selection means 21

Patents under this class:

Patent Number Title Of Patent Date Issued
8441193 Electronic frequency tuning magnetron May. 14, 2013
7724098 Gyromagnetic precession oscillator May. 25, 2010
7687749 Magnetron for microwave oven Mar. 30, 2010
6985042 Magnetron Jan. 10, 2006
6875970 Safety apparatus for output level-adjustable microwave oven Apr. 5, 2005
5767749 Microwave oscillator Jun. 16, 1998
5721470 Microwave generator apparatus comprising controller for automatically adjusting filament power of a magnetron Feb. 24, 1998
5676873 Microwave oven and magnetron with cold cathode Oct. 14, 1997
RE34863 High impedance circuit for injection locked magnetrons Feb. 21, 1995
5162698 Cascaded relativistic magnetron Nov. 10, 1992
5159241 Single body relativistic magnetron Oct. 27, 1992
5113154 Microwave generator device with virtual cathode May. 12, 1992
5045814 High impedance circuit for injection locked magnetrons Sep. 3, 1991
5043680 Resonant converter oscillator usable for powering a magnetron Aug. 27, 1991
5021713 Magnetron Jun. 4, 1991
4988956 Auto-resonant peniotron having amplifying waveguide section Jan. 29, 1991
4873408 Magnetron with microprocessor based feedback control Oct. 10, 1989
4820688 Traveling wave tube oscillator/amplifier with superconducting RF circuit Apr. 11, 1989
4785261 Magnetically insulated transmission line oscillator Nov. 15, 1988
4752720 Magnetron with fifth harmonic suppression projection in through capacitor seal Jun. 21, 1988
4730170 Virtual cathode microwave generator having annular anode slit Mar. 8, 1988
4668924 Free electron diode oscillator May. 26, 1987
4628284 High frequency high voltage power supply preventing simultaneous transistor conduction Dec. 9, 1986
4588965 Coaxial magnetron using the TE.sub.111 mode May. 13, 1986
4555680 Magnetron tuned programmably using step motor Nov. 26, 1985
4553068 High power millimeter-wave source Nov. 12, 1985
4517430 Microwave heating device with constant temperature control of the magnetron May. 14, 1985
4482870 Magnetron with magnetic yoke having annular projection Nov. 13, 1984
4481447 Power supply for a magnetron Nov. 6, 1984
4480234 Gyrotron backward wave oscillator device Oct. 30, 1984
4419606 Magnetron Dec. 6, 1983
4356431 Magnetron energizing circuit Oct. 26, 1982
4302651 High-voltage SCR circuit for microwave oven and the like Nov. 24, 1981
4288721 Microwave magnetron-type device Sep. 8, 1981
4268779 Circuit for controlling current flow from an A.C. source to a load May. 19, 1981
4175246 Energizing circuit for magnetron using dual transformer secondaries Nov. 20, 1979
4164685 Magnetron device Aug. 14, 1979
4017702 Microwave oven including apparatus for varying power level Apr. 12, 1977
4012617 Power controller for microwave magnetron Mar. 15, 1977
4001537 Power controller for microwave magnetron Jan. 4, 1977
3982152 Cascade crossed field device Sep. 21, 1976

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