Patents by Inventor David R. Pacholok
David R. Pacholok has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11076455Abstract: A portable induction heating tool includes a housing which includes a base having a support surface. The support surface defines a recess facing away from the housing. The recess is at least partially defined by a wall projecting from the support surface. A work coil is within the housing and secured to the base in a location aligned with the recess. The portable induction heating tool includes electronic circuitry which is configured to provide oscillating electrical energy to the work coil, thereby generating an oscillating magnetic field projecting away from the base. The electronic circuitry is also configured to detect a quantity of energy consumed by the work coil and to limit the quantity of energy to a predetermined quantity.Type: GrantFiled: April 20, 2018Date of Patent: July 27, 2021Assignee: OMG, Inc.Inventors: Joshua S. Kelly, Tamilselvan Samiappan, David R. Pacholok, William F. Mast
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Patent number: 10932328Abstract: The hand-held induction air-cooled induction heater used for heating of metallic mechanical or decorative objects to facilitate their removal or installation contains a high frequency inverter operating in voltage or current resonant mode, including power semiconductor switching device(s) having turn-on or turn-off delay time, circuitry to control the timing of on and off periods of said switching device(s), the circuitry having delay time, wherein the threshold voltage or current reference to initiate commutation or timing is not zero, and is dynamically varied in response to the instantaneous input inverter supply voltage and/or inverter frequency to achieve switching device(s) heating or dissipation reduction resulting from improved commutation timing of said power switching devices.Type: GrantFiled: August 26, 2018Date of Patent: February 23, 2021Inventor: David R. Pacholok
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Patent number: 10925121Abstract: The handheld, self contained, air cooled induction heater which engages an A.C. power source, a rectifier to convert A.C. to D.C., an inverter which converts the D.C. to A.C. operating at substantially higher frequency than the A.C. power line frequency, a high frequency step-down transformer having magnetic cores, wherein at least a primary winding is split into two parts which are each wound around one of two suitable structures such as legs of the transformer magnetic core, and a secondary winding being connected to heat dissipating terminals functionally engaged to a work coil. The transformer for the induction heater has a primary and secondary wound around two suitable structures such as both legs of a magnetic core to reduce leakage inductance and increase power output compared to the primary and secondary windings of the same number of turns all wound on one leg of the magnetic core.Type: GrantFiled: March 26, 2018Date of Patent: February 16, 2021Inventor: David R. Pacholok
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Publication number: 20200068666Abstract: The hand-held induction air-cooled induction heater used for heating of metallic mechanical or decorative objects to facilitate their removal or installation contains a high frequency inverter operating in voltage or current resonant mode, including power semiconductor switching device(s) having turn-on or turn-off delay time, circuitry to control the timing of on and off periods of said switching device(s), the circuitry having delay time, wherein the threshold voltage or current reference to initiate commutation or timing is not zero, and is dynamically varied in response to the instantaneous input inverter supply voltage and/or inverter frequency to achieve switching device(s) heating or dissipation reduction resulting from improved commutation timing of said power switching devices.Type: ApplicationFiled: August 26, 2018Publication date: February 27, 2020Inventor: David R. Pacholok
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Publication number: 20180242408Abstract: A portable induction heating tool includes a housing which includes a base having a support surface. The support surface defines a recess facing away from the housing. The recess is at least partially defined by a wall projecting from the support surface. A work coil is within the housing and secured to the base in a location aligned with the recess. The portable induction heating tool includes electronic circuitry which is configured to provide oscillating electrical energy to the work coil, thereby generating an oscillating magnetic field projecting away from the base. The electronic circuitry is also configured to detect a quantity of energy consumed by the work coil and to limit the quantity of energy to a predetermined quantity.Type: ApplicationFiled: April 20, 2018Publication date: August 23, 2018Inventors: Joshua S. Kelly, Tamilselvan Samiappan, David R. Pacholok, William F. Mast
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Publication number: 20170310098Abstract: An apparatus and method for greatly increasing power line surge/transient resistance of power semiconductors in inductive heating equipment, in which a sample of the instantaneous line voltage or its rectified equivalent is applied to a comparator input terminal, and a reference voltage corresponding to a predetermined surge shutdown voltage is applied to an opposite comparator input, such that comparator output changes state in response to the predetermined surge shutdown voltage, and is functionally connected to gate drive circuitry to disable gate drive circuitry for the duration of the surge/transient.Type: ApplicationFiled: April 20, 2016Publication date: October 26, 2017Inventor: David R. Pacholok
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Publication number: 20170238374Abstract: The handheld, self contained, air cooled induction heater includes an input connector for engaging an A.C. power source, a rectifier to convert A.C. to D.C., an inverter which converts the D.C. to A.C. operating at substantially higher frequency than the A.C. power line frequency, a high frequency step-down transformer having magnetic cores, wherein at least a primary winding is split into two substantially equal parts, each part being wound around one of two legs of the transformer magnetic core, and a secondary winding being connected to heat dissipating terminals capable of functional engagement to at least one work coil. Further according to the invention there is provided a transformer for the induction heater having a primary and secondary wound around both legs magnetic core so that leakage inductance is reduced and power output increased compared to the primary and secondary windings of the same number of turns all wound on one leg of the same shaped magnetic core.Type: ApplicationFiled: February 16, 2016Publication date: August 17, 2017Inventor: David R. Pacholok
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Patent number: 7808211Abstract: A high frequency battery charger includes a converter, drive logic, and control logic. The converter transforms a DC voltage into a high frequency AC voltage. The drive logic controls a conversion of the high frequency AC voltage through a train of pulses. The control logic adjusts the output of the converter to maximize a charging cycle of a battery. The method of transforming an AC input into a direct current output used to charge a rechargeable battery includes transforming an AC input into a first DC output; transforming the first DC output into a high frequency AC output; transforming the high frequency AC output into a second DC output; and passing a charging current to an external load when the load is correctly connected to an output.Type: GrantFiled: March 31, 2009Date of Patent: October 5, 2010Assignee: Schumacher Electric CorporationInventors: David R. Pacholok, Thomas Finis Johnson, Xiao Ping Chen
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Publication number: 20090206796Abstract: A high frequency battery charger includes a converter, drive logic, and control logic. The converter transforms a DC voltage into a high frequency AC voltage. The drive logic controls a conversion of the high frequency AC voltage through a train of pulses. The control logic adjusts the output of the converter to maximize a charging cycle of a battery. The method of transforming an AC input into a direct current output used to charge a rechargeable battery includes transforming an AC input into a first DC output; transforming the first DC output into a high frequency AC output; transforming the high frequency AC output into a second DC output; and passing a charging current to an external load when the load is correctly connected to an output.Type: ApplicationFiled: March 31, 2009Publication date: August 20, 2009Inventors: David R. Pacholok, Thomas Finis Johnson, Xiao Ping Chen
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Patent number: 7528579Abstract: A high frequency battery charger includes a converter, drive logic, and control logic. The converter transforms a DC voltage into a high frequency AC voltage. The drive logic controls a conversion of the high frequency AC voltage through a train of pulses. The control logic adjusts the output of the converter to maximize a charging cycle of a battery. The method of transforming an AC input into a direct current output used to charge a rechargeable battery includes transforming an AC input into a first DC output; transforming the first DC output into a high frequency AC output; transforming the high frequency AC output into a second DC output; and passing a charging current to an external load when the load is correctly connected to an output.Type: GrantFiled: August 24, 2004Date of Patent: May 5, 2009Assignee: Schumacher Electric CorporationInventors: David R. Pacholok, Thomas Finis Johnson, Xiao Ping Chen
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Patent number: 6710314Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.Type: GrantFiled: November 22, 2002Date of Patent: March 23, 2004Assignee: Nexicor LLCInventors: Edward A. Reiss, Adam G. Malofsky, John P. Barber, Gary L. Claypoole, Robert Carl Cravens, II, David R. Pacholok, Charles A. Kuecker
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Patent number: 6670590Abstract: The method and apparatus are for use in automotive vehicle repair, both mechanical and body. The apparatus includes at least an eddy current/hysteretic circuit and at least one applicator functionally engaged to the circuit for obtaining a desired result when the applicator is placed into contact with structure of the vehicle to be affected by heating thereof.Type: GrantFiled: June 13, 2002Date of Patent: December 30, 2003Inventors: David R. Pacholok, Thomas M. Gough
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Patent number: 6563096Abstract: The method and apparatus are for use in automotive vehicle repair, both mechanical and body. The apparatus includes at least an eddy current/hysteretic circuit and at least one applicator functionally engaged to the circuit for obtaining a desired result when the applicator is placed into contact with structure of the vehicle to be affected by heating thereof.Type: GrantFiled: August 12, 2002Date of Patent: May 13, 2003Inventors: David R. Pacholok, Thomas M. Gough
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Publication number: 20030071033Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.Type: ApplicationFiled: November 22, 2002Publication date: April 17, 2003Inventors: Edward A. Riess, Adam G. Malofsky, John P. Barber, Gary L. Claypoole, Robert Carl Cravens, David R. Pacholok, Charles A. Kuecker
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Patent number: 6509555Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.Type: GrantFiled: November 2, 2000Date of Patent: January 21, 2003Assignee: Nexicor LLCInventors: Edward A. Riess, Adam G. Malofsky, Bernard M. Malofsky, John P. Barber, Gary L. Claypoole, Robert Carl Cravens, II, David R. Pacholok, Charles A. Kuecker
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Patent number: 5921704Abstract: A mechanical tire deflating device provides a mechanism to deploy a folded deflating spike under a vehicle desired to be stopped. When the mechanical tire deflating device is under the vehicle being pursued, tire deflating spikes are extended in order to deflate the tires of the pursued vehicle.Type: GrantFiled: July 27, 1998Date of Patent: July 13, 1999Inventors: David R. Pacholok, Charles A. Kuecker
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Patent number: 5839849Abstract: A mechanical tire deflating device provides a mechanism to deploy a folded deflating spike under a vehicle desired to be stopped. When the mechanical tire deflating device is under the vehicle being pursued, tire deflating spikes are extended in order to deflate the tires of the pursued vehicle.Type: GrantFiled: February 21, 1997Date of Patent: November 24, 1998Inventors: David R. Pacholok, Charles A. Kuecker
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Patent number: 5805399Abstract: Apparatus for detecting series arcs and output load faults in high frequency luminous tube power supplies and ballasts including wideband ringing and detector circuits for collecting the intense high frequency, pre-plasma noise energy associated with the initial avalanche phase of high frequency arc formation and a transient suppressor for delaying the triggering of power supply shut-down for up to the duration of the arc avalanche phase. Plural detectors for increased sensitivity and reliability over a variety of arc locations may be employed. Dual purpose detector input probes serve as over-voltage corona generators.Type: GrantFiled: September 6, 1996Date of Patent: September 8, 1998Assignee: Everbrite, IncInventor: David R. Pacholok
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Patent number: 5668444Abstract: A dimmer oscillator for a high frequency luminous tube power supply including a frequency shiftable high frequency oscillator, a variable duty cycle low frequency oscillator operatively connected to the high frequency oscillator for controlling the high frequency oscillator between a first normal output operating frequency and a second higher frequency. A low pass filter within the high frequency supply whereby the supply output to a luminous tube load is reduced, when the oscillator is operating at the second higher frequency, to a low intensity ionization maintenance level. An integrator between the low and high frequency oscillators whereby the transition between the first nominal and second higher operating frequencies is smoothed to reduce acoustic noise and false GFI and OVP triggering. A frequency control diode between the low and high frequency oscillators to limit the lower frequency excursion, and to maintain oscillation of, the high frequency oscillator.Type: GrantFiled: June 17, 1994Date of Patent: September 16, 1997Assignee: Everbrite, Inc.Inventor: David R. Pacholok
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Patent number: 5645137Abstract: A compact and portable device is easily attached to and concealed on a vehicle and capable of disrupting the electronic systems required for vehicle operation.Type: GrantFiled: March 27, 1996Date of Patent: July 8, 1997Inventor: David R. Pacholok