Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7245082 | Mode seeding cathode for a relativistic magnetron A high-power relativistic magnetron wherein the cathode geometry is shaped to form a DC electric field that has a non-negligible azimuthal component causing preferential selection of the pi mode at startup (suppression of mode competition), a significant increase in... | 07/17/2007 |
| 7224444 | Method and device for optically measuring distance The invention relates to a method for optical distance measurement, in which a transmitter of a transmission branch (14), which branch is integrated with a measuring device (10), transmits a modulated measurement beam (16, 36) in the direction o... | 05/29/2007 |
| 7102110 | Magnetron oscillating apparatus A magnetron oscillating apparatus includes a magnetron, power supply unit, and switch circuit. The magnetron oscillates a microwave. The power supply unit applies a power to the magnetron. The switch circuit is connected between the power supply unit and the cathode... | 09/05/2006 |
| 6914556 | Method and apparatus for magnetron coherence A pulsed magnetron is caused to emit a series of RF energy pulses which are phase coherent with an injection signal by supplying the magnetron with a pedestal pulse during low-power signal injection. The pedestal being of a magnitude and duration such that the slow-... | 07/05/2005 |
| 6700532 | Magnetron drive circuit The invention provides a magnetron drive circuit which drives a magnetron to produce a generally rectangular-shaped narrow transmission pulse having sharply shaped rising and falling edges. The magnetron drive circuit includes a nonlinear load circuit and... | 03/02/2004 |
| 6492878 | High voltage pulse generation device for magnetron A high voltage pulse generation device for magnetron is disclosed. The device is divided into a DC voltage generation part, which continuously applies a variable DC voltage at a constant value to the load, and a pulse voltage generation part, which genera... | 12/10/2002 |
| 5760496 | Inverse-pinch voltage pulse generator A first magnetic flux field is produced in the vicinity of a generally cylindrical pulse generating coil arrangement and a plasma is abruptly and radially displaced outwardly toward the coil arrangement, which in turn displaces the first magnetic flux fie... | 06/02/1998 |
| 5537084 | Method for improving spectrum quality of low power pulsed anode magnetrons An improved low power pulsed anode magnetron is provided having a cylindrical cathode centrally disposed within a plurality of radial anode vanes. An interaction region is provided between the surface of the cathode and the anode vane tips. A ratio of the... | 07/16/1996 |
| 5515011 | Pulsed magnetron circuit with phase locked loop A semiconductor diode is connected across the cathode-to-anode path of a magnetron and through a storage capacitor and collector resistor to a supply voltage for enabling charging of the capacitor. A control pulse causes a switching transistor to conduct ... | 05/07/1996 |
| 5495209 | Switched-inverter modulator for producing modulated high voltage pulses A switched-inverter modulator for use in driving a load that comprises master and slave high voltage power supplies for providing output pulses that directly drive the load. A synchronized pulse generator provides pulse width tinting and synchronized ampl... | 02/27/1996 |
| 5347236 | Modulator for negative pulse activated oscillators A modulator for providing modulating voltages across the anode and cathode of a negatively pulsed magnetron includes a switch which, when activated, couples the modulating voltage source to the cathode terminal, a current regulator which maintains a const... | 09/13/1994 |
| 5115168 | Power supply for microwave discharge light source A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit includes a rectifier coupled across a commerical AC voltage source, a filter for smoothing the output of the rectifier, ... | 05/19/1992 |
| 5053682 | Power supply for microwave discharge light source A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit includes a rectifier coupled across a commercial AC voltage source, a filter for smoothing the output of the rectifier, ... | 10/01/1991 |
| 4988922 | Power supply for microwave discharge light source A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit comprises a rectifier coupled across a commercial AC voltage source, a filter for smoothing the output of the rectifier,... | 01/29/1991 |
| 4885506 | Electronic magnetron power supply In a power-line-operated inverter-type magnetron power supply having a high-Q resonant L-C circuit series-excited by the inverter and parallel-loaded by the magnetron, subject invention provides for cost-effective means to prevent the destructive overload... | 12/05/1989 |
| 4748424 | Magnetron with frequency control means In a magnetron having a rotatable tuning member in the form of a spinner (121), a rotation sensor and an associated processor (10) generates an indication signal (11) representing the instantaneous magnetron frequency. Three level discriminators 13(1), 13... | 05/31/1988 |
| 4672159 | Electrically controllable magnetron power supply In a power-line-operated electronic inverter-type power supply for the magnetron in a microwave oven, the unfiltered pulsed DC output of a full-wave rectifier is applied to a bridge inverter, the output of which is a 30 kHz squarewave voltage pulse-amplit... | 06/09/1987 |
| 4620078 | Power control circuit for magnetron A duty cycle power control circuit for a magnetron including a power transformer having a primary winding, a secondary anode winding for supplying anode voltage to the magnetron and a secondary filament winding for energizing the filament of the magnetron... | 10/28/1986 |
| 4489288 | High frequency pulse generating circuit A circuit for generating high frequency output pulses comprising a magnetron, a pulse transformer having its secondary winding coupled to apply firing pulses across the input terminals of the magnetron, charge storage means connected in circuit with the p... | 12/18/1984 |
| 4482816 | Pulse circuits A pulse circuit forms part of a radar transmitter in which a pulse forming network is used to generate a high current pulse at relatively low voltage and to feed it via a transformer to a magnetron which operates at typically 30 kV. A number of pulse form... | 11/13/1984 |
| 4405904 | Power control circuit for a magnetron oscillator A zero-crossing signal is generated in response to the zero-crossing of the current of an AC power source of a magnetron oscillator, and in response to the zero-crossing signal a triac connected between the magnetron oscillator and the AC power source is ... | 09/20/1983 |
| 4296296 | Controllable-duty-cycle power supply for microwave oven magnetron and the like A power supply for controlling the duty-cycle of a microwave oven magnetron and the like power-energizing load, includes a parallel combination of a non-linear resistance element, such as a varistor and the like, and a gateable semiconductor switching dev... | 10/20/1981 |
| 4171514 | Radar system with stable power output A radar system having automatic compensation to the heater power applied to the final output tube for changes in the peak tube power output. Substantially constant peak power is attained for radar pulses of varying widths and over a plurality of range sca... | 10/16/1979 |
| 4109216 | Microwave generator An active radar transmitter is disclosed having both long pulse and short lse operational modes. The transmitter is configured to switch between the operational modes with a minimum of circuitry to permit a single radar system to be used for long-range se... | 08/22/1978 |
| 4051439 | Short pulse magnetron transmitter A magnetron transmitter having a two-stage modulator, one stage generating long, slowly rising, low power pulse, and the other generating a short, high power pulse, whereby high resolution is obtainable without the use of pulse compression techniques.... | 09/27/1977 |
| 3973165 | Power supply for a microwave magnetron In a microwave energy generating system, a combination of a magnetron which generates microwave energy and an inverter which converts DC voltage to high frequency AC voltage are employed. The magnetron includes a heater-cathode and an anode. The inverter ... | 08/03/1976 |
| 3973145 | Weather radar transistorized pulse modulator A transistorized active switch radar pulse modulator has a unique means for pulse current control which includes a transformer interconnected with a magnetron. Transistor switches and related circuitry pulse a step up transformer with voltage pulses to dr... | 08/03/1976 |
| 3939319 | High-frequency heating device for variably controlling a high frequency output in a continuous or stepwise manner A high-frequency heating device includes an AC power source, a high-tension transformer, a triac thyristor connected between the primary winding of the high-tension transformer and the power source, a magnetron coupled to the secondary winding of the high... | 02/17/1976 |
