Patents by Inventor Glenn A. Forrest
Glenn A. Forrest 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: 7518354Abstract: An electronic circuit includes a first substrate having a first substrate surface and a device supported by the first substrate surface. The device is selected from among a passive electronic component and an active electronic component. The electronic circuit also includes a second substrate having a second substrate surface and a conductor proximate to the second substrate. The electronic circuit also includes a magnetic field transducer disposed over the conductor and coupled to the device and an insulating layer disposed between the conductor and the second substrate. The conductor is adapted to carry an electrical current to generate a first magnetic field. The electronic circuit is responsive to the first magnetic field. In some embodiments, the conductor is a secondary conductor and the circuit further includes a primary conductor disposed proximate to the magnetic field transducer and an insulating layer disposed between the primary conductor and the second substrate.Type: GrantFiled: June 25, 2007Date of Patent: April 14, 2009Assignee: Allegro Microsystems, Inc.Inventors: Jason Stauth, Richard Dickinson, Glenn Forrest, Ravi Vig
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Publication number: 20090049994Abstract: An oil filtering system for a storage unit configured to receive and hold oil from a fryer in a main storage space thereof includes a filtering unit and a conveying unit. The filtering unit is removably arranged on an inner bottom surface of the storage unit within the main storage space and configured to filter the oil in the storage unit via lower and upper filtering layers thereof. The conveying unit is removably connected to the filtering unit and has a portion extending upwardly from the filtering unit within the main storage space for conveying the filtered oil from the filtering unit.Type: ApplicationFiled: August 21, 2008Publication date: February 26, 2009Applicant: Illinois Tool Works, Inc.Inventors: Paul Glenn Forrest, Charles Amoss, Darrin P. Furgason
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Publication number: 20090024889Abstract: An integrated circuit and a method of built-in self test in the integrated circuit employ an offset control node and offset capabilities with the integrated circuit in order to communicate and distribute a built-in self-test signal. The built-in self-test signal can emulate signals internal to the integrated circuit during normal operation, and/or the built-in self-test signal can have other signal characteristics representative of signals other than those signals internal to the integrated circuit during normal operation.Type: ApplicationFiled: July 18, 2007Publication date: January 22, 2009Inventors: Glenn A. Forrest, Washington Lamar
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Publication number: 20090001972Abstract: A proximity detector employs a first peak detector circuit and a second peak detector circuit, both responsive to a magnetic field signal. The second peak detector circuit includes a positive peak detector circuit and a negative peak detector circuit, each of which have a predetermined excursion limit in an outward direction away from a center voltage of the magnetic field signal so as to be less affected by a large signature region in the magnetic field signal. The proximity detector also includes an output control circuit. The output control circuit is configured to provide an output signal, which, during a determined time period, changes state in response to the first peak detector circuit, and which, after the determined time period, changes state in response to the second peak detector circuit.Type: ApplicationFiled: June 26, 2007Publication date: January 1, 2009Inventors: Devon Fernandez, Jeff Eagen, Glenn A. Forrest, Mathew Drouin
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Patent number: 7307824Abstract: A switch which is magnetic pole insensitive is described. The switch includes a Hall effect sensor coupled to a threshold circuit which provides an output signal indicative of the proximity of a magnet, and hence a magnetic field, to the Hall effect sensor regardless of the orientation of the magnet to the Hall effect sensor.Type: GrantFiled: May 1, 2006Date of Patent: December 11, 2007Assignee: Allegro Microsystems, Inc.Inventors: Alberto Bilotti, Glenn A. Forrest, Ravi Vig
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Publication number: 20070247146Abstract: An electronic circuit includes a first substrate having a first substrate surface and a device supported by the first substrate surface. The device is selected from among a passive electronic component and an active electronic component. The electronic circuit also includes a second substrate having a second substrate surface and a conductor proximate to the second substrate. The electronic circuit also includes a magnetic field transducer disposed over the conductor and coupled to the device and an insulating layer disposed between the conductor and the second substrate. The conductor is adapted to carry an electrical current to generate a first magnetic field. The electronic circuit is responsive to the first magnetic field. In some embodiments, the conductor is a secondary conductor and the circuit further includes a primary conductor disposed proximate to the magnetic field transducer and an insulating layer disposed between the primary conductor and the second substrate.Type: ApplicationFiled: June 25, 2007Publication date: October 25, 2007Inventors: Jason Stauth, Richard Dickinson, Glenn Forrest, Ravi Vig
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Patent number: 7259545Abstract: An integrated sensor includes a magnetoresistance element electrically coupled to a device disposed on or integrated in a silicon substrate. A conductor is provided proximate to the magnetoresistance element. The integrated sensor can be used to provide various devices, such as a current sensor, a magnetic field sensor, or an isolator. Further, the integrated sensor can be used in an open loop configuration or in a closed loop configuration in which an additional conductor is provided. The magntoresistance element may be formed over the silicon substrate or on a separate, non-silicon substrate. Also described is an integrated sensor comprising a substrate, a magnetic field transducer disposed over a surface of the substrate, and a conductor disposed over the surface of the substrate proximate to the magnetic field transducer. The magnetic field transducer can be a Hall effect transducer or a magnetoresistance element.Type: GrantFiled: February 11, 2003Date of Patent: August 21, 2007Assignee: Allegro Microsystems, Inc.Inventors: Jason Stauth, Richard Dickinson, Glenn Forrest, Ravi Vig
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Patent number: 7253614Abstract: A proximity detector has a sequential flow state machine to identify states associated with a magnetic field signal provided by a magnetic field sensing element. The proximity detector can include a vibration processor to identify a vibration in response to the states.Type: GrantFiled: March 21, 2005Date of Patent: August 7, 2007Assignee: Allegro Microsystems, Inc.Inventors: Glenn A. Forrest, James M. Bailey, Washington Lamar
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Publication number: 20060208729Abstract: A proximity detector has a sequential flow state machine to identify states associated with a magnetic field signal provided by a magnetic field sensing element. The proximity detector can include a vibration processor to identify a vibration in response to the states.Type: ApplicationFiled: March 21, 2005Publication date: September 21, 2006Inventors: Glenn Forrest, James Bailey, Washington Lamar
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Publication number: 20060197522Abstract: A switch which is magnetic pole insensitive is described. The switch includes a Hall effect sensor coupled to a threshold circuit which provides an output signal indicative of the proximity of a magnet, and hence a magnetic field, to the Hall effect sensor regardless of the orientation of the magnet to the Hall effect sensor.Type: ApplicationFiled: May 1, 2006Publication date: September 7, 2006Inventors: Alberto Bilotti, Glenn Forrest, Ravi Vig
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Patent number: 7085119Abstract: A switch which is magnetic pole insensitive is described. The switch includes a Hall effect sensor coupled to a threshold circuit which provides an output signal indicative of the proximity of a magnet, and hence a magnetic field, to the Hall effect sensor regardless of the orientation of the magnet to the Hall effect sensor.Type: GrantFiled: July 21, 2003Date of Patent: August 1, 2006Assignee: Allegro Microsystems, Inc.Inventors: Alberto Bilotti, Glenn A. Forrest, Ravi Vig
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Publication number: 20060103377Abstract: Disclosed is a rotation detecting sensor suitable for use under a vibration-abundant condition as e.g. a sensor disposed in an automobile body for detecting rotation of an engine or ABS. The sensor includes a detecting element for detecting rotation of a rotary body as a change in a magnetic flux and outputting a signal and an integrated circuit for processing the amplified signal into a pulse corresponding to the detected rotation of the rotary body. The signal processing includes an initialization such as a gain adjustment for obtaining an appropriate gain for use in the subsequent process of conversion of the amplified signal to the pulse. According to this invention, a re-initialization is effected to obtain a new initial value such as a new gain if the previously effected initialization is determined inappropriate.Type: ApplicationFiled: November 17, 2004Publication date: May 18, 2006Applicants: AISIN SEIKI KABUSHIKI KAISHA, Allegro MicroSystems Inc.Inventors: Takashi Hara, Kazuhiro Kamiya, Kenichi Taguchi, Toshiyuki Matsuo, Takayoshi Tsuzuki, Glenn Forrest, Karl Scheller, Ravi Vig
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Patent number: 7046000Abstract: Disclosed is a rotation detecting sensor suitable for use under a vibration-abundant condition as e.g. a sensor disposed in an automobile body for detecting rotation of an engine or ABS. The sensor includes a detecting element for detecting rotation of a rotary body as a change in a magnetic flux and outputting a signal and an integrated circuit for processing the amplified signal into a pulse corresponding to the detected rotation of the rotary body. The signal processing includes an initialization such as a gain adjustment for obtaining an appropriate gain for use in the subsequent process of conversion of the amplified signal to the pulse. According to this invention, a re-initialization is effected to obtain a new initial value such as a new gain if the previously effected initialization is determined inappropriate.Type: GrantFiled: November 17, 2004Date of Patent: May 16, 2006Assignees: Aisin Seiki Kabushiki Kaisha, Allegro MicroSystems Inc.Inventors: Takashi Hara, Kazuhiro Kamiya, Kenichi Taguchi, Toshiyuki Matsuo, Takayoshi Tsuzuki, Glenn Forrest, Karl Scheller, Ravi Vig
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Patent number: 7026808Abstract: A method and apparatus for providing information from a speed and direction sensor is disclosed. The method and apparatus detect the presence of a ferromagnetic object as it moves past a sensor. The sensor determines speed and direction information regarding the ferromagnetic object, and further provides information relating to the environment surrounding the sensor or object, such as the status of an air gap between the sensor and the moving object, and the temperature of the environment in which the sensor or object is disposed.Type: GrantFiled: September 23, 2004Date of Patent: April 11, 2006Assignee: Allegro Microsystems, Inc.Inventors: Ravi Vig, Jay M. Towne, Glenn Forrest
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Publication number: 20050040814Abstract: A method and apparatus for providing information from a speed and direction sensor is disclosed. The method and apparatus detect the presence of a ferromagnetic object as it moves past a sensor. The sensor determines speed and direction information regarding the ferromagnetic object, and further provides information relating to the environment surrounding the sensor or object, such as the status of an air gap between the sensor and the moving object, and the temperature of the environment in which the sensor or object is disposed.Type: ApplicationFiled: September 23, 2004Publication date: February 24, 2005Inventors: Ravi Vig, Jay Towne, Glenn Forrest
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Patent number: 6815944Abstract: A method and apparatus for providing information from a speed and direction sensor is disclosed. The method and apparatus detect the presence of a ferromagnetic object as it moves past a sensor. The sensor determines speed and direction information regarding the ferromagnetic object, and further provides information relating to the environment surrounding the sensor or object, such as the status of an air gap between the sensor and the moving object, and the temperature of the environment in which the sensor or object is disposed.Type: GrantFiled: October 29, 2002Date of Patent: November 9, 2004Assignee: Allegro MicroSystems, Inc.Inventors: Ravi Vig, Jay M. Towne, Glenn Forrest
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Publication number: 20040155644Abstract: An integrated sensor includes a magnetoresistance element electrically coupled to a device disposed on or integrated in a silicon substrate. A conductor is provided proximate to the magnetoresistance element. The integrated sensor can be used to provide various devices, such as a current sensor, a magnetic field sensor, or an isolator. Further, the integrated sensor can be used in an open loop configuration or in a closed loop configuration in which an additional conductor is provided. The magntoresistance element may be formed over the silicon substrate or on a separate, non-silicon substrate. Also described is an integrated sensor comprising a substrate, a magnetic field transducer disposed over a surface of the substrate, and a conductor disposed over the surface of the substrate proximate to the magnetic field transducer. The magnetic field transducer can be a Hall effect transducer or a magnetoresistance element.Type: ApplicationFiled: February 11, 2003Publication date: August 12, 2004Inventors: Jason Stauth, Richard Dickinson, Glenn Forrest, Ravi Vig
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Patent number: 6693419Abstract: A proximity detector includes an offset circuit for bringing at least one of a magnetic field signal and a tracking signal towards the other one of the magnetic field signal and the tracking signal when the detector output signal changes state. A magnetic field-to-voltage transducer provides the magnetic field signal indicative of an ambient magnetic field and a peak detector responsive to the magnetic field signal provides the tracking signal which substantially follows the magnetic field signal. A comparator generates the detector output signal which changes state when the magnetic field signal varies from the tracking signal by a predetermined amount.Type: GrantFiled: May 28, 2002Date of Patent: February 17, 2004Assignee: Allegro Microsystems, Inc.Inventors: Jason T. Stauth, P. Karl Scheller, Glenn A. Forrest, Ravi Vig, Jay M. Towne
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Publication number: 20040027772Abstract: A switch which is magnetic pole insensitive is described. The switch includes a Hall effect sensor coupled to a threshold circuit which provides an output signal indicative of the proximity of a magnet, and hence a magnetic field, to the Hall effect sensor regardless of the orientation of the magnet to the Hall effect sensor.Type: ApplicationFiled: July 21, 2003Publication date: February 12, 2004Inventors: Alberto Bilotti, Glenn A. Forrest, Ravi Vig
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Publication number: 20030222637Abstract: A proximity detector includes an offset circuit for bringing at least one of a magnetic field signal and a tracking signal towards the other one of the magnetic field signal and the tracking signal when the detector output signal changes state. A magnetic field-to-voltage transducer provides the magnetic field signal indicative of an ambient magnetic field and a peak detector responsive to the magnetic field signal provides the tracking signal which substantially follows the magnetic field signal. A comparator generates the detector output signal which changes state when the magnetic field signal varies from the tracking signal by a predetermined amount.Type: ApplicationFiled: May 28, 2002Publication date: December 4, 2003Inventors: Jason T. Stauth, P. Karl Scheller, Glenn A. Forrest, Ravi Vig, Jay M. Towne