Patents by Inventor Bernard Gershen
Bernard Gershen 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: 5747980Abstract: A differential transformer includes a magnetic core within which difference signal detection inaccuracies resulting from non-homogeneity within the core are corrected by compensation. A phase wire extends proximate the magnetic core for transporting a first current in a first direction. A neutral wire extends proximate the magnetic core center for transporting a second current in a second direction which is substantially opposite the first direction. A shunt wire is electrically connected to one of: the phase wire and the neutral wire depending on whether the transformer is undersensitive or oversensitive. The shunt wire shunts a portion of the current flowing in one of the phase and neutral wires such that first and second signals are generated in the transformer as a result of said first and second currents that are substantially equal.Type: GrantFiled: May 30, 1995Date of Patent: May 5, 1998Assignee: Leviton Manufacturing Co., Inc.Inventor: Bernard Gershen
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Patent number: 5729417Abstract: A ground fault circuit interrupter (GFCI) with built in intelligence is described that includes circuitry to automatically indicate a device miswiring condition. When a GFCI is wired with its AC and LOAD terminals reversed, downstream devices are still protected in the event of a ground fault but the duplex receptacle on the GFCI itself is not. The invention incorporates miswiring sense circuitry that automatically triggers the generation of visual and audible alarms in the event a miswiring condition is sensed. The invention employs an alarm inhibiting technique that incorporates sense circuitry connected to the AC terminals on one side of the internal GFCI switches or relays and alarm generation circuitry connected to the LOAD terminals on the opposite side.Type: GrantFiled: December 15, 1995Date of Patent: March 17, 1998Assignee: Leviton Manufacturing Co., Inc.Inventors: Benjamin Neiger, Saul Rosenbaum, Bernard Gershen
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Patent number: 5729421Abstract: A circuit analyzing system includes a current transformer for extracting current from a phase or neutral conductor of a three phase line, a filter connected to the output of the current transformer and functioning to substantially trap current at the fundamental frequency while substantially passing currents at various harmonic frequencies thereof, and signal processing circuitry connected to the output of the filter to perform various functions with the harmonic frequency current input thereto. Among these functions, as shown in various preferred embodiments, are measurement of the harmonic signal in RMS and conveyance of the output to a display instrument for a user or utility's convenience in monitoring harmonic frequency circuits, which have become more corrosion with the advent of electronic equipment having internal power supplies such as personal computers, work stations, printers, and the like.Type: GrantFiled: February 21, 1996Date of Patent: March 17, 1998Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Alfred J. Lombardi, James E. Meehan, Saul Rosenbaum
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Patent number: 5715125Abstract: An intelligent circuit interrupt system is electrically connected between an AC source and a load for interrupting a flow of AC from the source to the load upon detection of an interrupt condition. A circuit interrupter electrically connected to phase and neutral terminals of the AC source defines the interrupt condition. A relay switch with a relay coil and phase and neutral contacts is included such that line and load ends of the phase contact are electrically connected, respectively, between the interrupt means load side phase port and a phase terminal of the load. Line and load ends of the neutral contact are electrically connected, respectively, between the interrupt neutral port and a neutral terminal of the load. The relay coil is electrically coupled between load sides of said phase and neutral contacts for controlling the contacts in response to the interrupt signal.Type: GrantFiled: January 28, 1997Date of Patent: February 3, 1998Assignee: Leviton Manufacturing Co., Inc.Inventors: Benjamin Neiger, Bernard Gershen, Saul Rosenbaum
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Patent number: 5706155Abstract: A ground fault circuit interrupter (GFCI) with built in intelligence is described that includes circuitry to automatically indicate a device miswiring condition. When a GFCI is wired with its AC and LOAD terminals reversed, downstream devices are still protected in the event of a ground fault but the duplex receptacle on the GFCI itself is not. The invention incorporates miswiring sense circuitry that automatically triggers the generation of visual and audible alarms in the event a miswiring condition is sensed. The invention employs an alarm inhibiting technique that incorporates sense circuitry connected to the AC terminals on one side of the internal GFCI switches or relays and alarm generation circuitry connected to the LOAD terminals on the opposite side.Type: GrantFiled: November 14, 1996Date of Patent: January 6, 1998Assignee: Leviton Manufacturing Co., Inc.Inventors: Benjamin Neiger, Saul Rosenbaum, Bernard Gershen
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Patent number: 5703458Abstract: A quiet motor speed controller is disclosed which varies an amplitude of an AC voltage signal provided from an AC source to drive an AC motor. The controller includes a first impedance in series connection between the source and the motor. A second impedance is electrically connectable with the first impedance in accordance with settings of a switch such that the total impedance interposed between the source and the load is varied by switching. The first and second impedances are substantially defined by first and second capacitive values, preferably including resistive elements to limit current flow at charging and discharging.Type: GrantFiled: June 14, 1995Date of Patent: December 30, 1997Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Edward Krajci, Benjamin Neiger
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Patent number: 5654857Abstract: A ground fault circuit interrupt system with auxiliary surge suppression ability is provided which includes line-side system, phase, neutral and ground terminals electrically connectable to phase, neutral and ground terminals of an AC source and load-side system, phase, neutral and ground terminals electrically connectable, respectively, to phase, neutral and ground terminals of an electrical load. The system includes a ground fault circuit interrupter including line- and load-side phase and neutral ports for electrical connection to the line-side system, phase and neutral terminals for controlling a state of conduction of AC between the source and electrical load in accordance with a detection of an interrupt condition.Type: GrantFiled: July 19, 1995Date of Patent: August 5, 1997Assignee: Leviton Manufacturing Co., Inc.Inventor: Bernard Gershen
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Patent number: 5652511Abstract: A device for and method of testing toroidal magnetic cores for magnetic anomalies which prevent uniform performance of the cores. The core is positioned on a drive device which can rotate the core through 360.degree.. The core passes through an input winding which receives the test signal and an output winding coupled to a display device which shows the presence or absence of such magnetic anomalies.Type: GrantFiled: June 7, 1995Date of Patent: July 29, 1997Assignee: Leviton Manufacturing Co., Inc.Inventors: James N. Pearse, Bernard Gershen
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Patent number: 5600524Abstract: An intelligent circuit interrupt system is electrically connected between an AC source and a load for interrupting a flow of AC from the source to the load upon detection of an interrupt condition. A circuit interrupter electrically connected to phase and neutral terminals of the AC source defines the interrupt condition. A relay switch with a relay coil and phase and neutral contacts is included such that line and load ends of the phase contact are electrically connected, respectively, between the interrupt means load side phase port and a phase terminal of the load. Line and load ends of the neutral contact are electrically connected, respectively, between the interrupt neutral port and a neutral terminal of the load. The relay coil is electrically coupled between load sides of said phase and neutral contacts for controlling the contacts in response to the interrupt signal.Type: GrantFiled: May 4, 1995Date of Patent: February 4, 1997Assignee: Leviton Manufacturing Co., Inc.Inventors: Benjamin Neiger, Bernard Gershen, Saul Rosenbaum
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Patent number: 5583730Abstract: The present invention teaches a new and novel system for protecting people and property against electrical shock. The invention includes a number of preferred and other embodiments which have this as their goal, but which represent a number of distinctive and novel approaches to solving prior art problems. By way of example only, and without limiting the scope of this invention, these approaches include novel immersion detecting circuits, broken wire test circuits, electromechanical circuit breaking means including coil/plunger arrangements, and relay circuit breaking mechanisms cooperative with associated circuitry, all of which are able to be incorporated as a system wholly within the load (appliance) and its associated cord set (including a "plug").Type: GrantFiled: September 6, 1995Date of Patent: December 10, 1996Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Saul Rosenbaum, James N. Pearse
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Patent number: 5499155Abstract: A circuit analyzing system includes a current transformer for extracting current from a phase or neutral conductor of a three phase line, a filter connected to the output of the current transformer and functioning to substantially trap current at the fundamental frequency while substantially passing currents at various harmonic frequencies thereof, and signal processing circuitry connected to the output of the filter to perform various functions with the harmonic frequency current input thereto. Among these functions, as shown in various preferred embodiments, are measurement of the harmonic signal in RMS and conveyance of the output to a display instrument for a user or utility's convenience in monitoring harmonic frequency circuits, which have become more common with the advent of electronic equipment having internal power supplies such as personal computers, work stations, printers, and the like.Type: GrantFiled: January 17, 1995Date of Patent: March 12, 1996Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Alfred J. Lombardi, James E. Meehan, Saul Rosenbaum
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Patent number: 5477412Abstract: A ground fault circuit interrupter (GFCI) with built in intelligence is described that includes circuitry to automatically indicate a device miswiring condition. When a GFCI is wired with its AC and LOAD terminals reversed, downstream devices are still protected in the event of a ground fault but the duplex receptacle on the GFCI itself is not. The invention incorporates miswiring sense circuitry that automatically triggers the generation of visual and audible alarms in the event a miswiring condition is sensed. The invention employs an alarm inhibiting technique that incorporates sense circuitry connected to the AC terminals on one side of the internal GFCI switches or relays and alarm generation circuitry connected to the LOAD terminals on the opposite side.Type: GrantFiled: July 8, 1993Date of Patent: December 19, 1995Assignee: Leviton Manufacturing Co., Inc.Inventors: Benjamin Neiger, Saul Rosenbaum, Bernard Gershen
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Patent number: 5446383Abstract: A device for and method of testing toroidal magnetic cores for magnetic anomalies which prevent uniform performance of the cores. The core is positioned on a drive device which can rotate the core through 360.degree.. The core passes through an input winding which receives the test signal and an output winding coupled to a display device which shows the presence or absence of such magnetic anomalies.Type: GrantFiled: March 11, 1994Date of Patent: August 29, 1995Assignee: Leviton Manufacturing Co., Inc.Inventors: James N. Pearse, Bernard Gershen
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Patent number: 5402298Abstract: The present invention teaches a new and novel system for protecting people and property against electrical shock. The invention includes a number of preferred and other embodiments which have this as their goal, but which represent a number of distinctive and novel approaches to solving prior art problems. By way of example only, and without limiting the scope of this invention, these approaches include novel immersion detecting circuits, broken wire test circuits, electromechanical circuit breaking means including coil/plunger arrangements, and relay circuit breaking mechanisms cooperative with associated circuitry, all of which are able to be incorporated as a system wholly within the load (appliance) and its associated cord set (including a "plug").Type: GrantFiled: October 19, 1993Date of Patent: March 28, 1995Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Saul Rosenbaum, James N. Pearse
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Patent number: 5383084Abstract: A circuit analyzing system includes a current transformer for extracting current from a phase or neutral conductor of a three phase line, a filter connected to the output of the current transformer and functioning to substantially trap current at the fundamental frequency while substantially passing currents at various harmonic frequencies thereof, and signal processing circuitry connected to the output of the filter to perform various functions with the harmonic frequency current input thereto. Among these functions, as shown in various preferred embodiments, are measurement of the harmonic signal in RMS and conveyance of the output to a display instrument for a user or utility's convenience in monitoring harmonic frequency circuits, which have become more common with the advent of electronic equipment having internal power supplies such as personal computers, work stations, printers, and the like.Type: GrantFiled: January 8, 1993Date of Patent: January 17, 1995Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Alfred J. Lombardi, James E. Meehan, Saul Rosenbaum
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Patent number: 5327047Abstract: A dimmer control system includes two discrete silicon controlled rectifiers which respectively energize a lamp load during alternate half cycles of the input AC voltage. The separate placement of the SCRs ensures that much lower temperatures are reached than would occur if a single triac were used to energize a lamp during both half cycles. The system also includes a pair of diacs which energize the respective SCRs when a respective capacitor directly connected to each diac discharges through one of them. The system further includes a respective capacitor charging circuit for each capacitor, each of the two charge circuits including a series connections of the gate to cathode junction of the SCR other than the one which the capacitor being charged discharges through, a diode, a common fixed resistor, and a common variable resistor.Type: GrantFiled: September 30, 1992Date of Patent: July 5, 1994Assignee: Leviton Manufacturing Co., Inc.Inventor: Bernard Gershen
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Patent number: 5166853Abstract: The present invention teaches a new and novel system for protecting people and property against electrical shock. The invention includes a number of preferred and other embodiments which have this as their goal, but which represent a number of distinctive and novel approaches to solving prior art problems. By way of example only and without limiting the scope of this invention, these approaches include novel immersion detecting circuits, broken wire test circuits, electromechanical circuit breaking means including coil/plunger arrangements, and relay circuit breaking mechanisms cooperative with associated circuitry, all of which are able to be incorporated as a system wholly within the load (appliance) and its associated cord set (including a "plug").Type: GrantFiled: September 11, 1991Date of Patent: November 24, 1992Assignee: Leviton Manufacturing Co., Inc.Inventors: Bernard Gershen, Saul Rosenbaum, James N. Pearse
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Patent number: 4709293Abstract: The present invention teaches a system for protecting people and property against electrical shock which includes immersion detecting circuits, broken wire test circuits, electromechanical circuit breaking means including coil/plunger arrangements, and relay circuit breaking mechanisms cooperative with associated circuitry, all of which are able to be incorporated as a system wholly within the load (appliance) and its associated cord set (including a "plug").Type: GrantFiled: January 9, 1987Date of Patent: November 24, 1987Assignee: Leviton Manufacturing Company, Inc.Inventors: Bernard Gershen, Saul Rosenbaum, James N. Pearse
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Patent number: 4396869Abstract: A variable voltage power supply includes a switching device through which line AC current is passed in response to the time during which a level setting voltage is applied to a control circuit for the switching device. During the duration of the level setting signal, periodic electrical signals are applied to a counter which is cyclicly incremented and decremented between predetermined lower and upper count limits until the level setting signal is terminated. The count is used as a measure of time into each half cycle of the line AC voltage at which the switch device is closed, the switch device being opened in response to the zero voltage crossing at the end of each half cycle of the AC voltage.Type: GrantFiled: August 27, 1980Date of Patent: August 2, 1983Assignee: Leviton Manufacturing Company, Inc.Inventors: Saul Rosenbaum, Howard S. Leopold, Bernard Gershen