Famous Patents
In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7432484 | Current control for high-frequency heating apparatus The invention relates to a high frequency heating apparatus and provides a tracking method of a frequency modulation in order to prevent an extension of the harmonic current component of an oscillation threshold ebm which varies from moment to moment in accordance w... | 10/07/2008 |
| 7312427 | High-frequency dielectric heating device and printed board with thermistor A high-frequency dielectric heating device includes: a microwave output unit including an inverter unit using a semiconductor switching element, heat-radiating fins for radiating the heat generated by an IGBT, and a printed board having a thermistor for detecting th... | 12/25/2007 |
| 7109454 | Microwave oven A microwave oven is provided with an integrated operating unit having an integrated function for power supply, power level control, and inrush current suppression. The integrated operating unit includes a rotary dial, a shaft fixed, at one end thereof, to the rotary... | 09/19/2006 |
| 7064305 | Apparatus and method for controlling output of magnetron of microwave oven An apparatus and method for controlling an output of a magnetron of a microwave oven is provided. The method includes setting an initial input current to generate an output higher than rated output. Thereafter, the magnetron is driven using initial input current of ... | 06/20/2006 |
| 7060954 | Magnetron drive power supply Timing of zero voltage in zero-voltage detector for detecting zero voltage of a commercial power supply 1 is predicted and input from the zero-voltage detector 6 is received only for a given time before and after the predicted timing, whereby overvolta... | 06/13/2006 |
| 7030350 | Microwave oven equipped with toaster and method of controlling the same A microwave oven equipped with a toaster and a method of controlling the same. Particularly, the microwave oven equipped with the toaster is provided with a plurality of heaters and a plurality of buttons each corresponding to one or more heaters to selectively oper... | 04/18/2006 |
| 6875970 | Safety apparatus for output level-adjustable microwave oven A safety apparatus for an output level-adjustable microwave oven includes a fuse disposed in a power supply line that connects a high power relay or a low power relay with a primary coil of a high voltage transformer of the microwave oven. Where a wrong operation oc... | 04/05/2005 |
| 6855918 | Microwave oven and method of controlling the same upon recognizing power supply frequency A microwave oven and a method of controlling the microwave oven recognize a power supply frequency correctly at a time power is supplied by eliminating the influence of noise. A blocking period is set in which generation of interrupts is deferred until a timer count... | 02/15/2005 |
| 6698657 | Method and apparatus for data interpretation An interactive interpreter of synchronous or asynchronous selective data from an annular indicia. The annular indicia has data contained thereon that is formatted into bit-cells. The bit-cells are angularly positioned about the circumference of the annula... | 03/02/2004 |
| 6515265 | Microwave oven in which rush current to high voltage transformer is suppressed When power supply to a high voltage transformer starts, the phase θ of the voltage of an AC power source when power supply to the high voltage transformer is stopped last time is referred to. In accordance with the value of the phase θ, the phase of the... | 02/04/2003 |
| 6420972 | Door monitor for a gaming machine A door-monitoring system comprises a power supply electrically connected to an oscillator. The oscillator sends a signal to a junction between a switch to ground and a latch circuit. When the switch to ground is open, current flows from the oscillator to ... | 07/16/2002 |
| 6396038 | Wall-mounted microwave oven and method for controlling the same A wall-mounted microwave oven and a method for controlling the same, wherein the microwave oven and a hood unit are prevented from being operated at maximum power at the same time in the initial operation state. The microwave oven comprises a hood unit dr... | 05/28/2002 |
| 6335520 | Microwave oven and a method for controlling the same Disclosed is a microwave oven comprising a power supply part supplying a commercial alternating current (AC) power, a rectifying and filtering part rectifying and filtering the commercial AC power, a high voltage transformer generating a high voltage by m... | 01/01/2002 |
| 6218652 | Apparatus for eliminating inrush current of a microwave oven In the microwave oven having a high voltage driving part with a high voltage transformer, a switching unit applies electric power to the high voltage driving part. In the switching unit, when switched on, an operational contact firstly comes in contact wi... | 04/17/2001 |
| 5994684 | Surge current prevention circuit of microwave oven A surge current prevention circuit of a microwave oven, where a surge relay is turned on or turned off by a predetermined DC voltage supplied by rectification of a predetermined low voltage, such that cost of parts of the surge current prevention circuit ... | 11/30/1999 |
| 5928552 | Power supply circuit of a microwave oven A power supply circuit of a microwave oven includes a door switch connected between an AC power supply and a magnetron driving circuit for switching in accordance with a door opening/closing operation, and a power supply control switch connected between t... | 07/27/1999 |
| 5883366 | Method for controlling power relay of microwave oven An improved method for controlling a power relay of a microwave oven which is capable of reducing the generation of sparking which occurs when the contact points of the power relay are separated, by turning off the power relay at a time (2n-1) π+3/4πdur... | 03/16/1999 |
| 5777301 | Relay driving apparatus for microwave oven and method thereof In a relay driving apparatus and method for a microwave oven, a high relay driving voltage is applied at an initial relay driving time to reduce the operating time deviation between relay parts and the high relay driving voltage is lowered to a normal rel... | 07/07/1998 |
| 5742032 | Microwave oven with transformer having resistive heating in series with the primary winding A microwave oven has a food-receiving cavity and a magnetron for delivering microwave power to the cavity. The magnetron is supplied with a high voltage through a transformer, and a variable impedance is connected in series with the primary winding of the... | 04/21/1998 |
| 5595674 | Microwave oven with power switching controller An improved controller for a microwave oven capable of preventing it from an undesired heating caused by an erroneous operation thereof, which includes a heating member for generating heating energy; a power switch for controlling electric power supply to... | 01/21/1997 |
| 5558796 | Apparatus for adjusting the cooking time and power output of a microwave oven A microwave oven has a cooking time selecting unit and a cooking power selecting unit. The cooking time selecting unit has a first shaft which extends through a control panel and a first knob is mounted on the first shaft. The cooking power selecting unit... | 09/24/1996 |
| 5451750 | Microwave output stabilizing apparatus of a microwave oven and a method thereof A microwave output stabilizing apparatus for a microwave oven comprises a rectifier circuit for rectifying power from an AC power supply into a constant DC voltage; an invertor circuit for generating a high frequency power supply by controlling the DC vol... | 09/19/1995 |
| 5378877 | Method and apparatus for performing programmed cooking with an automatic delay start feature in microwave ovens The present invention provides a method and system for performing a delay start regardless of the open/close state of the microwave oven door, where the present time Tp is continually counted after a warning signal telling a user to close the door is prod... | 01/03/1995 |
| 5362946 | Cooking appliance that prevents initiation of cooking cycle after predetermined time elapses after door closure A cooking appliance has several sensors to detect which attachment has been placed in a cooking compartment. When a door to the compartment is closed and a start switch is operated within ten seconds, the appliance automatically starts cooking in a mode d... | 11/08/1994 |
| 5357087 | Method for controlling a power relay for actuating a magnetron of a microwave oven A method for controlling a power relay for actuating a magnetron of a microwave oven in which contacts thereof are closed at various points of time or phase of an AC sinusoidal waveform input thereto with an equal probability, thereby preventing a transfe... | 10/18/1994 |
| 5317115 | Electronic control for a microwave oven A microwave oven having microwave source and a power unit associated therewith which is supplied with mains voltage via a relay. A microprocessor device comprised in the oven is used for controlling switch-on and switch-off of the relay, eliminating there... | 05/31/1994 |
| 5171949 | Switching power supply for microwave oven The present invention relates to a switching power supply a microwave oven in which DC power is changed to a pulse form by means of a switching element coupled to a primary winding of an inverter transformer to supply the power to a high frequency oscilla... | 12/15/1992 |
| 5091617 | High frequency heating apparatus using inverter-type power supply A high-frequency heating apparatus comprises an inverter including a semiconductor switch and a resonance capacitor, a boosting transformer for a supplying high-voltage power and heater to a magnetron an inductance device inserted in the heater circuit of... | 02/25/1992 |
| 5005123 | Control system for microwave cooking appliance A control system for a microwave oven includes a magnetron power circuit, an electronic controller, and input control circuitry. The control system is adapted to be connected to a source of electrical power, typically an AC line supply. The line supply ma... | 04/02/1991 |
| 4990733 | Microwave oven with improved microwave power control A microwave oven for heating food, in which power control is by pulsing a microwave source during a sequence of operation periods. The start moment of the microwave source is sensed during each operation period, and the switch on time of the microwave sou... | 02/05/1991 |
| 4987556 | Heating cooking appliance with relay testing In a high frequency cooking apparatus including a magnetron, a fan motor, turntable motor, a plurality of relays for controlling them and a microcomputer controlling the relays, the microcomputer is provided with a relay test program. The relay test progr... | 01/22/1991 |
| 4967051 | High-frequency heating apparatus having start control device for magnetron power supply circuit A high-frequency heating apparatus comprises a semiconductor power converter which is supplied with electric power from a commercial power supply, a radio wave radiation section which is energized by the semiconductor power converter, a control section wh... | 10/30/1990 |
| 4958055 | Control circuit for a refrigerator combined with a microwave oven A control circuit for a refrigerator combined with a microwave oven includes signal delay selecting and comparing circuitry start sensing circuitry timer circuitry and load driving circuitry in order to properly control operations of the refrigerator and ... | 09/18/1990 |
| 4931609 | High-frequency heating apparatus having a digital-controlled inverter A high-frequency heating source supplies a predetermined high-frequency heating power. An AC input is supplied to an inverter circuit. The inverter circuit generates a high-frequency output signal for driving the high-frequency heating source. The inverte... | 06/05/1990 |
| 4866590 | Supply having a load invariant auxiliary power supply supplied from a main transformer and a current suppressing inductor Disclosed is a switching power source having a series connection composed of a main transformer, a current-suppressing inductance element, and a switching element and connected across a DC input power source, in which output windings are additionally woun... | 09/12/1989 |
| 4755647 | Control unit for power-supply circuit in electronic range In an electronic range, an opening/closing operation of a range door thereof is manually conducted while switching operation of a power-supply circuit is conducted through a push-button type starting switch to make it possible that a control unit for the ... | 07/05/1988 |
| 4638137 | Heating appliance having a fail-safe start switch This invention relates to a fail-safe device for a heating appliance having a control system based upon a microcomputer. More particularly, there is provided a heating appliance which prevents malfunction of the control system caused by faulty operation o... | 01/20/1987 |
| 4628439 | Supervised start system for microprocessor based appliance controls A supervised start system for microprocessor based appliance controls and effective to prevent unwanted start operation of the associated appliance due to failure of a critical component of the starting system. The starting system requires a mechanical op... | 12/09/1986 |
| 4556773 | High frequency heating appliance having protection against rush currents A high frequency heating appliance has a monitor circuit for a door switch, wherein a current-limiting resistor and a fuse are provided in the monitor circuit for the door switch and serve as components of a bypass circuit for a relay. This arrangement pr... | 12/03/1985 |
| 4539453 | Control circuit for a microwave oven A control circuit for a microwave oven with a mechanical switch locking assembly, wherein a cooking start switch is available to turn on after closing a door and is turned off when the door is opened. The control circuit includes a relay for connecting a ... | 09/03/1985 |
