Patents by Inventor David Wightman
David Wightman 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: 20070220911Abstract: A vapor compression system including an evaporator, a compressor, and a condenser interconnected in a closed-loop system and a method of operating such a system. The method includes the conversion of expanded liquid heat transfer fluid from a liquid form to a high quality liquid vapor mixture before delivery to the evaporator.Type: ApplicationFiled: May 14, 2007Publication date: September 27, 2007Applicant: XDX Technology LLCInventor: David Wightman
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Patent number: 7225627Abstract: A vapor compression system including an evaporator, a compressor, and a condenser interconnected in a closed-loop system and a method of operating such a system. The method includes the conversion of expanded liquid heat transfer fluid from a liquid form to a high quality liquid vapor mixture before delivery to the evaporator.Type: GrantFiled: September 23, 2004Date of Patent: June 5, 2007Assignee: XDX Technology, LLCInventor: David A. Wightman
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Patent number: 7152415Abstract: A refrigeration system is employed to cool a refrigerated compartment in a kitchen or restaurant. An electronic refrigeration controller controls various aspects of the refrigerated compartment, including temperature. When a push button is pressed, a “sleep-mode” is activated to safely shut the refrigeration system down and turn the evaporator fan off. An employee can then stock or remove inventory from the refrigerated compartment without cool air blowing on the employee. After a predetermined amount of time, the sleep-mode ends and cool air blows into the refrigerated compartment.Type: GrantFiled: March 18, 2004Date of Patent: December 26, 2006Assignee: Carrier Commercial Refrigeration, Inc.Inventors: Michael Micak, David A. Wightman
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Publication number: 20050257564Abstract: A vapor compression system including an evaporator, a compressor, and a condenser interconnected in a closed-loop system and a method of operating such a system. The method includes the conversion of expanded liquid heat transfer fluid from a liquid form to a high quality liquid vapor mixture before delivery to the evaporator.Type: ApplicationFiled: September 23, 2004Publication date: November 24, 2005Inventor: David Wightman
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Patent number: 6951117Abstract: A vapor compression system (10) including an evaporator (16), a compressor (12), and a condenser (14) interconnected in a closed-loop system. In one embodiment, a multifunctional valve (18) is configured to receive a liquefied heat transfer fluid from the condenser (14) and a hot vapor from the compressor (12). A saturated vapor line (28) connects the outlet of the evaporator (16) and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve (18) into a saturated vapor prior to delivery to the evaporator (16). The multifunctional valve (18) regulates the flow of heat transfer fluid by monitoring the temperature of the heat transfer fluid returning to the compressor (12) through a suction line (30) coupling the evaporator (16) outlet to the compressor (12) inlet. In one preferred embodiment, a bifurcated liquid line connects the condenser (14) outlet to the first inlet of an multifunctional valve and the inlet of a metering unit.Type: GrantFiled: May 26, 2000Date of Patent: October 4, 2005Assignee: XDX, Inc.Inventor: David A Wightman
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Publication number: 20050204757Abstract: A refrigeration system is employed to cool a refrigerated compartment in a kitchen or restaurant. An electronic refrigeration controller controls various aspects of the refrigerated compartment, including temperature. When a push button is pressed, a “sleep-mode” is activated to safely shut the refrigeration system down and turn the evaporator fan off. An employee can then stock or remove inventory from the refrigerated compartment without cool air blowing on the employee. After a predetermined amount of time, the sleep-mode ends and cool air blows into the refrigerated compartment.Type: ApplicationFiled: March 18, 2004Publication date: September 22, 2005Inventors: Michael Micak, David Wightman
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Patent number: 6915648Abstract: Flow-regulating members are described that include a primary channel and a plurality of secondary channels. The primary channel defines a primary channel orifice in the flow-regulating member and the plurality of secondary channels define a plurality of secondary channel orifices in the flow-regulating member. The plurality of secondary channel orifices are located along a common periphery of the flow-regulating member, such that an axis passing through the primary channel orifice intersects a plane containing the common periphery at a unique point. At least two of the plurality of secondary channel orifices have different cross-sectional areas. At least one of the plurality of secondary channels intersects the primary channel. Expansion devices containing these flow-regulating members are also described, as are vapor compression systems containing expansion devices, and methods of operating vapor compression systems.Type: GrantFiled: December 20, 2002Date of Patent: July 12, 2005Assignee: XDX Inc.Inventor: David A. Wightman
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Publication number: 20050092002Abstract: Expansion valves are described that include a housing containing an inlet and an outlet, one or both of which is configured for coupling to an expansion device; a valve orifice provided between the inlet and the outlet; a valve member configured for engagement with the valve orifice; and an expandable member coupled to the valve member by a transmitting element and configured for moving the valve member into and out of engagement with the valve orifice. The expansion device includes a flow-regulating member that contains at least a first and a second channel forming at least first and second channel orifices, respectively, such that a cross-sectional area of the first channel orifice is larger than a cross-sectional area of the second channel orifice. A cross-sectional area of the valve orifice is at least as large as the cross-sectional area of the first orifice.Type: ApplicationFiled: September 22, 2004Publication date: May 5, 2005Inventor: David Wightman
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Patent number: 6857281Abstract: A vapor compression system having a line for flowing heat transfer fluid, a compressor and a condenser both connected with the line. The vapor compression system also has an expansion device connected with the line for expanding the heat transfer fluid. The expansion device has a housing defining a housing orifice and at least one ball within the housing. The ball forms at least two channels, wherein each channel defines a channel orifice. The effective cross-sectional area of the one channel orifice is greater than the effective cross-sectional area of the other channel orifice. Moreover, the ball is movable between a first position and a second position, wherein the housing orifice is effectively made larger in the first position than in the second position. The vapor compression system also has an evaporator connected with the line for transferring heat from ambient surroundings to the heat transfer fluid.Type: GrantFiled: March 16, 2001Date of Patent: February 22, 2005Assignee: XDX, LLCInventor: David A. Wightman
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Patent number: 6751970Abstract: A vapor compression refrigeration and freezer system includes a compressor, a condenser, an expansion devise and an evaporator which includes an evaporator coil having an inlet and an outlet which coil is in heat exchange relation with an air medium along substantially the entire coil length. The inlet to the evaporator coil is in flow communication with an outlet of the expansion devise via an evaporator feedline.Type: GrantFiled: November 26, 2002Date of Patent: June 22, 2004Assignee: XDX, Inc.Inventor: David A. Wightman
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Patent number: 6644052Abstract: A vapor compression refrigeration and freezer system includes a compressor, a condenser, an expansion devise and an evaporator which includes an evaporator coil having an inlet and an outlet which coil is in heat exchange relation with an air medium along substantially the entire coil length. The inlet to the evaporator coil is in flow communication with an outlet of the expansion devise via an evaporator feedline.Type: GrantFiled: November 18, 1999Date of Patent: November 11, 2003Assignee: XDX, LLCInventor: David A. Wightman
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Publication number: 20030140644Abstract: A vapor compression refrigeration and freezer system includes a compressor, a condenser, an expansion devise and an evaporator which includes an evaporator coil having an inlet and an outlet which coil is in heat exchange relation with an air medium along substantially the entire coil length. The inlet to the evaporator coil is in flow communication with an outlet of the expansion devise via an evaporator feedline.Type: ApplicationFiled: November 26, 2002Publication date: July 31, 2003Inventor: David A. Wightman
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Publication number: 20030126873Abstract: A vapor compression refrigeration system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquified heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.Type: ApplicationFiled: October 3, 2001Publication date: July 10, 2003Applicant: XDX, LLCInventor: David A. Wightman
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Publication number: 20030121274Abstract: Flow-regulating members are described that include a primary channel and a plurality of secondary channels. The primary channel defines a primary channel orifice in the flow-regulating member and the plurality of secondary channels define a plurality of secondary channel orifices in the flow-regulating member. The plurality of secondary channel orifices are located along a common periphery of the flow-regulating member, such that an axis passing through the primary channel orifice intersects a plane containing the common periphery at a unique point. At least two of the plurality of secondary channel orifices have different cross-sectional areas. At least one of the plurality of secondary channels intersects the primary channel. Expansion devices containing these flow-regulating members are also described, as are vapor compression systems containing expansion devices, and methods of operating vapor compression systems.Type: ApplicationFiled: December 20, 2002Publication date: July 3, 2003Inventor: David A. Wightman
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Patent number: 6581398Abstract: A vapor compression system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.Type: GrantFiled: July 10, 2001Date of Patent: June 24, 2003Assignee: XDX Inc.Inventor: David A. Wightman
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Publication number: 20020157416Abstract: A vapor compression system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.Type: ApplicationFiled: April 22, 2002Publication date: October 31, 2002Applicant: XDX, LLC.Inventor: David A. Wightman
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Patent number: 6401471Abstract: A vapor compression system including a line for flowing heat transfer fluid, a compressor connected with the line for increasing the pressure and temperature of the heat transfer fluid, a condenser connected with the line for liquefying the heat transfer fluid, and an expansion device connected with the line for expanding the heat transfer fluid. The expansion device includes a housing defining a first orifice, and at least one blade connected with the housing, wherein the blade is movable between a first position and a second position, wherein the first orifice is larger in the first position than in the second position. The vapor compression system also includes an evaporator connected with the line for transferring heat from ambient surroundings to the heat transfer fluid.Type: GrantFiled: November 20, 2001Date of Patent: June 11, 2002Assignee: XDX, LLCInventor: David A. Wightman
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Patent number: 6401470Abstract: A vapor compression system including a line for flowing heat transfer fluid, a compressor connected with the line for increasing the pressure and temperature of the heat transfer fluid, a condenser connected with the line for liquefying the heat transfer fluid, and an expansion device connected with the line for expanding the heat transfer fluid. The expansion device includes a housing defining a first orifice, and at least one blade connected with the housing, wherein the blade is movable between a first position and a second position, wherein the first orifice is larger in the first position than in the second position. The vapor compression system also includes an evaporator connected with the line for transferring heat from ambient surroundings to the heat transfer fluid.Type: GrantFiled: September 14, 2000Date of Patent: June 11, 2002Assignee: XDX, LLCInventor: David A. Wightman
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Patent number: 6397629Abstract: A vapor compression system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.Type: GrantFiled: December 6, 2000Date of Patent: June 4, 2002Assignee: XDX, LLCInventor: David A. Wightman
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Patent number: 6393851Abstract: A vapor compression system including a compressor, a condenser, an expansion valve, and an evaporator. The compressor increases the pressure and temperature of a heat transfer fluid. The condenser is connected with the compressor for liquefying the heat transfer fluid. The expansion valve is connected with the condenser and includes an expansion device for expanding the heat transfer fluid, and an internal sensor for detecting conditions within the heat transfer fluid. The evaporator is connected with the expansion valve for transferring heat from ambient surroundings to the heat transfer fluid.Type: GrantFiled: September 14, 2000Date of Patent: May 28, 2002Assignee: XDX, LLCInventor: David A. Wightman