Patents by Inventor Vu T. Nguyen
Vu T. Nguyen 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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Publication number: 20150323587Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: ApplicationFiled: January 24, 2014Publication date: November 12, 2015Applicant: DIEHL AKO STIFTUNG & CO. KGInventors: JOCHEN AICHER, ROBERT J. ALVORD, JAMES W. KOPEC, VU T. NGUYEN
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Publication number: 20150212148Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: ApplicationFiled: January 24, 2014Publication date: July 30, 2015Applicant: DIEHL AKO STIFTUNG & CO. KGInventors: JOCHEN AICHER, ROBERT J. ALVORD, JAMES W. KOPEC, VU T. NGUYEN
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Patent number: 8686737Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: GrantFiled: June 22, 2011Date of Patent: April 1, 2014Assignee: Diehl AKO Stiftung & Co. KGInventors: Jochen Aicher, Robert J. Alvord, James W. Kopec, Vu T. Nguyen
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Publication number: 20110248722Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: ApplicationFiled: June 22, 2011Publication date: October 13, 2011Applicant: DIEHL AKO STIFTUNG & CO. KGInventors: Jochen Aicher, Robert J. Alvord, James W. Kopec, Vu T. Nguyen
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Patent number: 8013615Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: GrantFiled: February 28, 2008Date of Patent: September 6, 2011Assignee: Diehl Ako Stiftung & Co. KGInventors: Jochen Aicher, Robert J. Alvord, James W. Kopec, Vu T. Nguyen
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Publication number: 20090219034Abstract: A diagnostic circuit is configured for connecting to a unit under test that has a load and a sinusoidal source. The diagnostic circuit includes a voltage sensing device that has an input for sensing a signal, a first terminal for connecting to the load, a second terminal for connecting to the sinusoidal source, and a relay connected between the first and second terminals for connecting the sinusoidal source to the load. Clamping diodes are provide for clamping a sinusoidal signal and include a first clamping diode connected between a D/C voltage source and the input and a second clamping diode connected between ground and the input. A resistor is connected between the D/C voltage source and the first terminal. The diagnostic circuit verifies the operational functionality of the load, related wiring and connections.Type: ApplicationFiled: February 28, 2008Publication date: September 3, 2009Applicant: DIEHL AKO STIFTUNG & CO. KGInventors: Jochen Aicher, Robert J. Alvord, James W. Kopec, Vu T. Nguyen
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Patent number: 6657945Abstract: A forced flow of cooling air through a computer housing is created during operation of a specially designed data storage disc drive structure operatively disposed in the housing. The drive, which is illustratively a CD ROM drive, has a bladed carrying structure which supports a compact disc and is rotationally driven with the supported disc. Driven rotation of the bladed carrying structure creates the forced flow of cooling air within the housing without requiring additional space for a separate cooling fan therein. In two illustrated embodiments of the bladed carrying structure the created cooling air flow is generally parallel to the rotational axis of the compact disc, and in a third embodiment of the bladed carrying structure the created cooling air flow is generally transverse to the rotational axis.Type: GrantFiled: March 18, 2002Date of Patent: December 2, 2003Assignee: Hewlett-Packard Development Company, L.P.Inventor: Vu T. Nguyen
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Patent number: 6647472Abstract: A computer system supports a fast hibernation operation to save power, while minimizing the amount of time it takes to enter the hibernation mode, and to resume normal operations. The system periodically stores data from system memory to non-volatile memory, such as a hard disk drive, during normal operations when the system is idle. The system includes activity monitors that detect when the data in memory pages is changed. The system periodically sweeps the monitors, and performs save operations to the non-volatile memory. When the system enters hibernation mode, the system determines which memory pages have been changed since the last save operation, and then saves those pages to memory. As an alternative, the system immediately can enter hibernation by supplying power to the memory pages that have not been saved since the last save operation. To implement this, independent switches under the control of the CPU of memory controller selectively turn off power to unsaved memory pages.Type: GrantFiled: February 14, 2003Date of Patent: November 11, 2003Assignee: Hewlett-Packard Development Company, L.P.Inventors: Lee W. Atkinson, Vu T. Nguyen, Mark W. Peters
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Publication number: 20030131206Abstract: A computer system supports a fast hibernation operation to save power, while minimizing the amount of time it takes to enter the hibernation mode, and to resume normal operations. The system periodically stores data from system memory to non-volatile memory, such as a hard disk drive, during normal operations when the system is idle. The system includes activity monitors that detect when the data in memory pages is changed. The system periodically sweeps the monitors, and performs save operations to the non-volatile memory. When the system enters hibernation mode, the system determines which memory pages have been changed since the last save operation, and then saves those pages to memory. As an alternative, the system immediately can enter hibernation by supplying power to the memory pages that have not been saved since the last save operation. To implement this, independent switches under the control of the CPU of memory controller selectively turn off power to unsaved memory pages.Type: ApplicationFiled: February 14, 2003Publication date: July 10, 2003Applicant: Hewlett-Packard Development Company, L.P.Inventors: Lee W. Atkinson, Vu T. Nguyen, Mark W. Peters
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Patent number: 6546472Abstract: A computer system supports a fast hibernation operation to save power, while minimizing the amount of time it takes to enter the hibernation mode, and to resume normal operations. The system periodically stores data from system memory to non-volatile memory, such as a hard disk drive, during normal operations when the system is idle. The system includes activity monitors that detect when the data in memory pages is changed. The system periodically sweeps the monitors, and performs save operations to the non-volatile memory. When the system enters hibernation mode, the system determines which memory pages have been changed since the last save operation, and then saves those pages to memory. As an alternative, the system immediately can enter hibernation by supplying power to the memory pages that have not been saved since the last save operation. To implement this, independent switches under the control of the CPU of memory controller selectively turn off power to unsaved memory pages.Type: GrantFiled: December 29, 2000Date of Patent: April 8, 2003Assignee: Hewlett-Packard Development Company, L.P.Inventors: Lee W. Atkinson, Vu T. Nguyen, Mark W. Peters
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Publication number: 20020101815Abstract: A forced flow of cooling air through a computer housing is created during operation of a specially designed data storage disc drive structure operatively disposed in the housing. The drive, which is illustratively a CD ROM drive, has a bladed carrying structure which supports a compact disc and is rotationally driven with the supported disc. Driven rotation of the bladed carrying structure creates the forced flow of cooling air within the housing without requiring additional space for a separate cooling fan therein. In two illustrated embodiments of the bladed carrying structure the created cooling air flow is generally parallel to the rotational axis of the compact disc, and in a third embodiment of the bladed carrying structure the created cooling air flow is generally transverse to the rotational axis.Type: ApplicationFiled: March 18, 2002Publication date: August 1, 2002Inventor: Vu T. Nguyen
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Publication number: 20020087816Abstract: A computer system supports a fast hibernation operation to save power, while minimizing the amount of time it takes to enter the hibernation mode, and to resume normal operations. The system periodically stores data from system memory to non-volatile memory, such as a hard disk drive, during normal operations when the system is idle. The system includes activity monitors that detect when the data in memory pages is changed. The system periodically sweeps the monitors, and performs save operations to the non-volatile memory. When the system enters hibernation mode, the system determines which memory pages have been changed since the last save operation, and then saves those pages to memory. As an alternative, the system immediately can enter hibernation by supplying power to the memory pages that have not been saved since the last save operation. To implement this, independent switches under the control of the CPU of memory controller selectively turn off power to unsaved memory pages.Type: ApplicationFiled: December 29, 2000Publication date: July 4, 2002Inventors: Lee W. Atkinson, Vu T. Nguyen, Mark W. Peters
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Patent number: 6359856Abstract: A forced flow of cooling air through a computer housing is created during operation of a specially designed data storage disc drive structure operatively disposed in the housing. The drive, which is illustratively a CD ROM drive, has a bladed carrying structure which supports a compact disc and is rotationally driven with the supported disc. Driven rotation of the bladed carrying structure creates the forced flow of cooling air within the housing without requiring additional space for a separate cooling fan therein. In two illustrated embodiments of the bladed carrying structure the created cooling air flow is generally parallel to the rotational axis of the compact disc, and in a third embodiment of the bladed carrying structure the created cooling air flow is generally transverse to the rotational axis.Type: GrantFiled: August 3, 1998Date of Patent: March 19, 2002Assignee: Compaq Computer CorporationInventor: Vu T. Nguyen
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Publication number: 20010038602Abstract: A forced flow of cooling air through a computer housing is created during operation of a specially designed data storage disc drive structure operatively disposed in the housing. The drive, which is illustratively a CD ROM drive, has a bladed carrying structure which supports a compact disc and is rotationally driven with the supported disc. Driven rotation of the bladed carrying structure creates the forced flow of cooling air within the housing without requiring additional space for a separate cooling fan therein. In two illustrated embodiments of the bladed carrying structure the created cooling air flow is generally parallel to the rotational axis of the compact disc, and in a third embodiment of the bladed carrying structure the created cooling air flow is generally transverse to the rotational axis.Type: ApplicationFiled: August 3, 1998Publication date: November 8, 2001Inventor: VU T. NGUYEN
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Patent number: 5793740Abstract: A forced flow of cooling air through a computer housing is created during operation of a specially designed CD ROM drive operatively disposed in the housing. The drive has a bladed carrying structure which supports a compact disc and is rotationally driven with the supported disc. Driven rotation of the bladed carrying structure creates the forced flow of cooling air within the housing without requiring additional space for a separate cooling fan therein. In two illustrated embodiments of the bladed carrying structure the created cooling air flow is generally parallel to the rotational axis of the compact disc, and in a third embodiment of the bladed carrying structure the created cooling air flow is generally transverse to the rotational axis.Type: GrantFiled: December 31, 1996Date of Patent: August 11, 1998Assignee: Compaq Computer CorporationInventor: Vu T. Nguyen
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Patent number: 5533350Abstract: A method for determining the time to begin and end a defrosting cycle of an evaporator included within a refrigeration system. Decisions as to initiate and terminate defrosting operations are predicated on information about the external temperature of the system and measuring differences in the rate of change of temperature drop between non-iced and iced conditions.Type: GrantFiled: December 16, 1994Date of Patent: July 9, 1996Assignee: Robertshaw Controls CompanyInventors: Joseph R. Gromala, Vu T. Nguyen
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Patent number: 5524444Abstract: A method of controlling the temperature of air inside two compartments of a refrigerator or similar appliance utilizing a single temperature sensor and the known air temperature external of the appliance. Based on knowledge of the temperature relationship between both compartments, the appliance performance is optimized based on outside temperatures. As a result of this process, the compartment without a sensor functions with increased temperature control accuracy.Type: GrantFiled: December 16, 1994Date of Patent: June 11, 1996Assignee: Robertshaw Controls CompanyInventors: Joseph R. Gromala, Vu T. Nguyen