Patents by Inventor Ronald Graham Silver
Ronald Graham Silver 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: 9194266Abstract: A power system includes a dual fuel engine, a first fuel source configured to provide a first fuel to the engine, and a second fuel source configured to provide a second fuel to the engine different than the first fuel. The power system also includes an exhaust system configured to receive combustion exhaust from the engine. The exhaust system includes a reduction catalyst comprising palladium catalyst material and an oxidation catalyst comprising cobalt catalyst material. Additionally, changing a ratio of the first fuel provided to the engine relative to the second fuel changes a NOx conversion efficiency of the reduction catalyst.Type: GrantFiled: July 27, 2012Date of Patent: November 24, 2015Assignee: Caterpillar Inc.Inventors: Ronald Graham Silver, Paul Sai Keat Wang, David T. Montgomery
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Patent number: 9051858Abstract: An engine system includes an electronically controlled compression ignition engine configured to burn diesel fuel to produce an exhaust with a temperature and NOx to soot ratio. An aftertreatment system is fluidly connected to the engine and includes a diesel oxidation catalyst, a reductant supply, and a diesel particulate filter coated with a NOx reduction catalyst but not the diesel oxidation catalyst. A soot load density in the diesel particulate filter is stabilized by oxidizing soot at about a same rate as the compression ignition engine is supplying soot to the aftertreatment system without active regeneration. A NOx reduction reaction is catalyzed by the NOx reduction catalyst on the diesel particulate filter.Type: GrantFiled: March 30, 2011Date of Patent: June 9, 2015Assignee: Caterpillar Inc.Inventors: Ronald Graham Silver, David Mark Heaton, James Joshua Driscoll, Anibal Villatoro Prats, Lyn McWilliam
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Patent number: 8992869Abstract: A treatment device configured to receive a flow of exhaust from a power source is disclosed. The treatment device may have a first layer, a second layer, and a substrate layer. The first layer may include a selective catalytic reduction layer, and the second layer may be disposed downstream of the first layer and include an oxidation catalyst support. The substrate layer may be disposed adjacent to the second layer. Additionally, an additive may be disposed downstream of the first layer. The additive may be operative to substantially prohibit migration of a component of the second layer to the first layer upon treatment of the flow of exhaust by the oxidation catalyst support.Type: GrantFiled: December 20, 2012Date of Patent: March 31, 2015Assignee: Caterpillar Inc.Inventors: Joshua L Ratts, Ronald Graham Silver
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Publication number: 20140178273Abstract: A treatment device configured to receive a flow of exhaust from a power source is disclosed. The treatment device may have a first layer, a second layer, and a substrate layer. The first layer may include a selective catalytic reduction layer, and the second layer may be disposed downstream of the first layer and include an oxidation catalyst support. The substrate layer may be disposed adjacent to the second layer. Additionally, an additive may be disposed downstream of the first layer. The additive may be operative to substantially prohibit migration of a component of the second layer to the first layer upon treatment of the flow of exhaust by the oxidation catalyst support.Type: ApplicationFiled: December 20, 2012Publication date: June 26, 2014Applicant: Caterpillar Inc.Inventors: Joshua L Ratts, Ronald Graham Silver
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Publication number: 20140026541Abstract: A power system includes a dual fuel engine, a first fuel source configured to provide a first fuel to the engine, and a second fuel source configured to provide a second fuel to the engine different than the first fuel. The power system also includes an exhaust system configured to receive combustion exhaust from the engine. The exhaust system includes a reduction catalyst comprising palladium catalyst material and an oxidation catalyst comprising cobalt catalyst material. Additionally, changing a ratio of the first fuel provided to the engine relative to the second fuel changes a NOx conversion efficiency of the reduction catalyst.Type: ApplicationFiled: July 27, 2012Publication date: January 30, 2014Inventors: Ronald Graham Silver, Paul Sai Keat Wang, David T. Montgomery
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Publication number: 20130047583Abstract: An aftertreatment system for an internal combustion engine includes a treatment device having a combined particulate filter and SCR catalyst. The combined particulate filter and SCR catalyst treats uncatalyzed exhaust from the internal combustion engine including between approximately 7 g NOx/kW-hr and approximately 10 g NOx/kW-hr.Type: ApplicationFiled: August 31, 2011Publication date: February 28, 2013Inventors: James Joshua Driscoll, David Mark Heaton, Ronald Graham Silver, Brandon Ted Shull
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Publication number: 20120247085Abstract: An engine system includes an electronically controlled compression ignition engine configured to burn diesel fuel to produce an exhaust with a temperature and NOx to soot ratio. An aftertreatment system is fluidly connected to the engine and includes a diesel oxidation catalyst, a reductant supply, and a diesel particulate filter coated with a NOx reduction catalyst but not the diesel oxidation catalyst. A soot load density in the diesel particulate filter is stabilized by oxidizing soot at about a same rate as the compression ignition engine is supplying soot to the aftertreatment system without active regeneration. A NOx reduction reaction is catalyzed by the NOx reduction catalyst on the diesel particulate filter.Type: ApplicationFiled: March 30, 2011Publication date: October 4, 2012Applicant: CATERPILLAR INC.Inventors: Ronald Graham Silver, David Mark Heaton, James Joshua Driscoll, AnĂbal Villatoro Prats, Lyn McWilliam
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Publication number: 20100154393Abstract: The present disclosure is directed to a filtering element. The filtering element may comprise at least one channel defined by at least one wall. The at least one wall extends longitudinally from a first end of the channel to a second end of the channel, the at least one channel having an unobstructed first end and an unobstructed second end. The filtering element further includes at least one partial barrier configured to reduce a path of a flow of exhaust through the at least one channel, the at least one partial barrier being positioned within the at least one channel so as to redirect a portion of the exhaust flow within the channel. The at least one channel includes a selective catalytic reduction catalyst on at least a portion of one of a surface of the at least one partial barrier or a surface of the at least one wall.Type: ApplicationFiled: December 19, 2008Publication date: June 24, 2010Inventors: Ronald Graham Silver, Thomas Edward Paulson
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Patent number: 7673446Abstract: An exhaust emission control system for an internal combustion engine is disclosed. The exhaust emission control system has a first passageway and a second passageway disposed to receive exhaust in parallel. The exhaust emission control system also has a valve arrangement configured to regulate the flow of exhaust to the first and second passageways, and at least one sensor configured to sense a parameter indicative of a constituent of the exhaust. The at least one sensor generates a signal corresponding to the sensed parameter. The exhaust emission control system also has a controller in communication with the valve and the at least one sensor. The controller is configured to affect operation of the valve in response to the signal.Type: GrantFiled: January 29, 2007Date of Patent: March 9, 2010Assignee: Caterpillar Inc.Inventors: Svetlana Mikhailovna Zemskova, Julie Marie Faas, Christie Susan Ragle, Matthew Owen Stefanick, Ronald Graham Silver
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Publication number: 20080178579Abstract: An exhaust emission control system for an internal combustion engine is disclosed. The exhaust emission control system has a first passageway and a second passageway disposed to receive exhaust in parallel. The exhaust emission control system also has a valve arrangement configured to regulate the flow of exhaust to the first and second passageways, and at least one sensor configured to sense a parameter indicative of a constituent of the exhaust. The at least one sensor generates a signal corresponding to the sensed parameter. The exhaust emission control system also has a controller in communication with the valve and the at least one sensor. The controller is configured to affect operation of the valve in response to the signal.Type: ApplicationFiled: January 29, 2007Publication date: July 31, 2008Inventors: Svetlana Mikhailovna Zemskova, Julie Marie Faas, Christie Susan Ragle, Matthew Owen Stefanick, Ronald Graham Silver