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The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
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| Number | Title | Issue Date |
| 7825357 | Power supply, image forming apparatus, and electric current supply method This invention provides a power supply which supplies an AC electric current to the coil of a heating unit employing the electromagnetic induced heating method via a connector connecting a plurality of wires, and a method for the power supply. The method includes th... | 11/02/2010 |
| 7245091 | Inverter capable of switching working frequency An inverter capable of switching working frequency for activating a lamp. The inverter comprises a voltage converter, a feedback circuit, a control unit and a frequency switcher. The voltage converter transforms a DC input voltage into a second AC voltage according ... | 07/17/2007 |
| 7176424 | Induction heating cooking apparatus and method for operating the same An induction-heating cooking apparatus and a method for operating the same are disclosed. Upon receiving a low-voltage signal in a high-output level state, the apparatus controls an output signal to allow an inverter to be operated only in a ZVS (Zero Voltage Switch... | 02/13/2007 |
| 7145111 | Heater drive circuit A heater control circuit performs ON/OFF control of a switching converter for a FET so that an AC line current supplied from a DI terminal becomes approximate to a predetermined value. A current flowing to a heater is stabilized to a predetermined value, and, unless... | 12/05/2006 |
| 7075044 | Induction heating cooking apparatus, operation of which is interrupted by container eccentricity An induction-heating cooking apparatus, operation of which is interrupted by container eccentricity is disclosed. Upon receiving an input signal varying with the degree of eccentricity of a container, the apparatus changes a reference signal for determining the pres... | 07/11/2006 |
| 7034263 | Apparatus and method for inductive heating A system and method for inductive heating, in which a power source provides current pulses with high-frequency harmonics to a heater coil, the coil generating a magnetic flux for inductive heating of an article. The high-frequency harmonics enhance a relative propor... | 04/25/2006 |
| 7034264 | Heating systems and methods utilizing high frequency harmonics Heating systems and methods for inductive heating or a combination of resistive and inductive heating. A heater coil is inductively coupled to an article and a current signal is supplied to the heater coil. The heater coil generates a magnetic flux, based on the app... | 04/25/2006 |
| 6965098 | Energization cycle counter for induction heating tool An induction heat treating process with a sensor for monitoring the duration of energization of an induction heating coil each time the induction heating coil is consecutively cycled. The sensor is preferably a counting mechanism attached to or embedded within the i... | 11/15/2005 |
| 6956188 | Induction heating coil with integrated resonant capacitor and method of fabrication thereof, and induction heating system employing the same An induction heating coil with integrated resonant capacitor is provided, along with methods of fabrication thereof, and induction heating systems employing the same. The induction heating coil includes a cable having a first conductor and a second conductor separat... | 10/18/2005 |
| 6930293 | Induction heating apparatus, heat fixing apparatus and image forming apparatus An induction heating apparatus for a fixing device of an image forming apparatus includes a rectifying circuit for rectifying a commercial power supply, an excitation coil, a switching element for switching the supply of the output of the rectifying circuit to the e... | 08/16/2005 |
| 6870144 | Inverter circuit of induction heating rice cooker An inverter circuit of an induction heating rice cooker which controls a switching frequency of an inverter in a variable manner according to a variation in an input voltage and drives the inverter at the controlled switching frequency. The inverter circuit comprise... | 03/22/2005 |
| 6812440 | Induction heating device An induction heating device prevents an object to be heated from being displaced and buoyed from a mounting surface due to an mutual action of repulsive forces between the object to be heated and an induction heating coil. The induction heating device includes a sou... | 11/02/2004 |
| 6392210 | Methods and apparatus for RF power process operations with automatic input power control A variable frequency RF power delivery system is used with a control system that adjusts the output frequency of the RF power delivery system. Frequency adjustments are made so as to maintain the required input current and input voltage within the capabil... | 05/21/2002 |
| 6163019 | Resonant frequency induction furnace system using capacitive voltage division An induction furnace having a voltage source series inverter, a load circuit having a combination of an induction coil and a resonating capacitor bank, and control circuitry to phase lock the inverter frequency to the natural resonant frequency of the loa... | 12/19/2000 |
| 5789721 | High-frequency induction heater and power source circuit for same A high-frequency induction heater having a working coil for providing a high-frequency application of power to a sample is provided with a control circuit for controlling the amount of power to the working coil. A phase control member can be triggered to ... | 08/04/1998 |
| 5760379 | Monitoring the bond line temperature in thermoplastic welds Quality welds are highly dependent upon achieving appropriate temperatures everywhere along the bond line. The present invention uses multinode thermocouples to measure the bond line temperature in real time and to provide control signals for the moving c... | 06/02/1998 |
| 5523631 | Control system for powering plural inductive loads from a single inverter source A control system for controlling overshoot and undershoot power values when switching power from a single inverter power source to a plurality of inductive loads, or a single load having a plurality of zones, having different resonant frequencies. The con... | 06/04/1996 |
| 5450305 | Resonant power supplies This resonant power supply produces a varying magnetic field from a resonant inductor. Two active switches drive, but remain outside, a resonant circuit, also including resonant capacitor. A phase-splitting transformer provides, via a decoupling inductor,... | 09/12/1995 |
| 5434389 | Device for monitoring current in an induction heating coil A monitor device for creating a current signal having a voltage representative of the instantaneous alternating current in an induction heating coil connected to an alternating current supply by two closely spaced, parallel input conductors separated by a... | 07/18/1995 |
| 5376775 | High frequency induction heating appliance A high frequency induction heating appliance comprising a working coil for generating a high frequency signal, a switching device for switching a drive voltage to the working coil, a low voltage transformer for lowering an AC power voltage, an input curre... | 12/27/1994 |
| 5331127 | Dual push-pull induction heating drive circuit A dual push-pull induction heating drive circuit comprises an oscillation triggering control circuit regulating the ON-OFF switch of the circuit activation, a switching logic circuit bringing about two exclusive pulse signals serving to drive via an ampli... | 07/19/1994 |
| 5329100 | Circuit for compensating for output of high frequency induction heating cooker A circuit for compensating for the output of a high frequency induction heating cooker, comprising a rectifying circuit for rectifying an external AC input power into a DC power and applying the DC power to a working coil, an output regulation signal gene... | 07/12/1994 |
| 5319174 | Induction heating cooker with constant frequency controlled inverter An induction heating cooker has a rectifier (13) for producing pulsating DC current, an inverter (14) which receives the pulsating current given from the rectifier (13) and produces a high frequency output current and a load circuit (15) including an outp... | 06/07/1994 |
| 5165049 | Phase difference control circuit for induction furnace power supply A control system for power delivered to an inductive load includes automatic control with a manual override for emergency situations. The system monitors the power delivered to the load and varies the power delivered to the inductive load by controlling t... | 11/17/1992 |
| 5111014 | Electromagnetic cooker including load control In an electromagnetic cooking apparatus, low heating power control is carried out by turning ON/OFF a DC power supply circuit, or rectifier circuit, at a commercial frequency lower than an inverting frequency of DC/AC inverter. The electromagnetic cooking... | 05/05/1992 |
| 5053596 | Apparatus and method of induction-hardening machine components with precise power output control An induction-hardening machine for the contour hardening of machine components such as gears includes a system processor which controls thyristor power switching circuits which supply high-power signals to an RF generator. Power switching circuits include... | 10/01/1991 |
| 5010223 | Output control circuit of a 4-burner electronics induction heating cook system and a control method thereof An output control circuit of a 4-burner electronics induction heating cook system comprises a unit for measuring the proportional setting time to selectively operate the timing on-off control and the frequency control of a heating load; an invertor circui... | 04/23/1991 |
| 4900884 | Composite cooking system having microwave heating and induction heating An inverter rectifies an AC input to produce a DC output and switches the DC output so as to selectively obtain a high-frequency output for microwave or induction heating. A microwave heating unit is coupled to the inverter, receives the high-frequency ou... | 02/13/1990 |
| 4757177 | High-frequency induction heating system with circuit protective feature A high-frequency induction system can generally be achieved by detecting noise superimposed on AC power supply which might induce voltages exceeding the given break-down voltage of a switching device and in such cases by temporarily shutting off the power... | 07/12/1988 |
| 4686340 | Induction heating apparatus with unsuitable load detecting circuit An electromagnetic induction heating apparatus having a detecting circuit for detecting an unsuitable load thereof, which detects an input AC power and an exciting current for an inverter so that the levels thereof are compared with each other to discrimi... | 08/11/1987 |
| 4595814 | Induction heating apparatus utilizing output energy for powering switching operation An induction heating apparatus comprises a rectifier (2) for rectifying a voltage from an AC mains supply, a resonance circuit formed by an induction heating coil (4) and a capacitor (4), a semiconductor switching device (6) connected in circuit with the ... | 06/17/1986 |
| 4560851 | Single-ended push-pull induction heating apparatus An induction heating apparatus comprises an SEPP inverter including two transistors (Q1, Q2) connected in series, one transistor (Q1) being connected to a high electric potential end of a direct current power source (DB1) and the other transistor (Q2) bei... | 12/24/1985 |
| 4540866 | Induction heating apparatus An induction heating apparatus which is adapted to stop heating when a load is abnormal and adjust the time period of turning on a switching element of an inverter circuit including an induction heating coil for the load to thereby adjust the input power ... | 09/10/1985 |
| 4467165 | Induction heating apparatus In an induction heating apparatus wherein heat is generated in a magnetic material by eddy currents produced by high frequency magnetic field of a heating coil (32), zero crossing point of the voltage developed in the heating coil (32) is detected and the... | 08/21/1984 |
| 4320273 | Apparatus for heating an electrically conductive cooking utensil by magnetic induction An induction heating apparatus comprising a static power converter operative to produce high-frequency power from low-frequency power and a heating unit to produce a time-varying magnetic field in response to the high-frequency power. The power converter ... | 03/16/1982 |
| 4277667 | Induction heating apparatus with negative feedback controlled pulse generation An induction heating apparatus includes a DC power source, a transistor for generating a trigger current in response to a base drive pulse applied thereto, and a resonant load circuit including a work coil and a capacitor for generating in response to the... | 07/07/1981 |
| 4210827 | Control circuit for generating a step-type control signal and a continuously varying control signal whose amplitude characteristic repeats at the step transition A control circuit uses an adjustable resistance to generate a first control signal whose amplitude varies with the setting of the resistance and a second, step-like control signal whose level changes from a first to a second level at a predetermined setti... | 07/01/1980 |
| 4145592 | Induction heating apparatus with means for detecting zero crossing point of high-frequency oscillation to determine triggering time Induction heating apparatus using gate-controlled switching devices includes a zero crossing point detector for detecting the occurrence of each zero crossing point of high frequency energization current, and a timing circuit which provides timing action ... | 03/20/1979 |
| 4115676 | Induction heating apparatus An induction heating apparatus comprises a DC power source, a series resonant circuit of a heating coil and capacitance connected between the terminals of the DC power source, a diode connected in parallel with the capacitor and in polarity-reversed relat... | 09/19/1978 |
| 4063229 | Article surveillance Sensor-emitter labels or tags containing a two-terminal nonlinear capacitor, e.g., a semiconductor diode, directly connected to antenna means are applied to articles for purpose of surveillance. A transmitter coupled to an antenna establishes an electroma... | 12/13/1977 |
