Patents by Inventor Nam-Hyo Cho
Nam-Hyo Cho 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: 11598246Abstract: A piston for an internal combustion engine includes a piston bowl. The piston bowl has a half section profile that includes a bowl entry extending radially from the longitudinal piston center axis, a first bowl recess extending radially from the bowl entry and defining a bowl depth and a first radius of curvature, a second bowl recess extending radially from a first bowl recess to an end perimeter surface and defining a second radius of curvature, a bowl lip defined by the first bowl recess and the second bowl recess, and a bowl edge defined by the second bowl recess and the end perimeter surface. The first bowl recess further defines a first bowl recess exit angle at the bowl lip. The second bowl recess further defines a second bowl recess exit angle at the bowl edge.Type: GrantFiled: June 23, 2021Date of Patent: March 7, 2023Assignee: DEERE & COMPANYInventors: Dustin W. Ridenour, Nam Hyo Cho, Michael J. Maney, James M. Krasselt, Bryan T. Geisick, Ankit Y. Patel
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Publication number: 20220412249Abstract: A piston for an internal combustion engine includes a piston bowl. The piston bowl has a half section profile that includes a bowl entry extending radially from the longitudinal piston center axis, a first bowl recess extending radially from the bowl entry and defining a bowl depth and a first radius of curvature, a second bowl recess extending radially from a first bowl recess to an end perimeter surface and defining a second radius of curvature, a bowl lip defined by the first bowl recess and the second bowl recess, and a bowl edge defined by the second bowl recess and the end perimeter surface. The first bowl recess further defines a first bowl recess exit angle at the bowl lip. The second bowl recess further defines a second bowl recess exit angle at the bowl edge.Type: ApplicationFiled: June 23, 2021Publication date: December 29, 2022Inventors: DUSTIN W. RIDENOUR, NAM HYO CHO, MICHAEL J. MANEY, JAMES M. KRASSELT, BRYAN T. GEISICK, ANKIT Y. PATEL
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Patent number: 10731600Abstract: A piston includes a piston body having an outer cylindrical surface and defined along a longitudinal piston center axis. The piston further includes a piston bowl with a half section profile with a bowl entry extending radially from the longitudinal piston center axis; a bowl recess extending radially from the bowl entry; and a soot shelf extending from the bowl recess to define a soot shelf axial height (H) and a soot shelf radial width (W). The soot shelf includes an inner step being formed by an inner step base surface extending radially from the bowl recess; an outer step being formed by a step shoulder surface extending axially from the inner step base surface and an outer step base surface extending radially from the step shoulder surface; and a soot shelf shoulder surface extending axially from outer step base surface to the end perimeter surface.Type: GrantFiled: November 7, 2017Date of Patent: August 4, 2020Assignee: DEERE & COMPANYInventors: Nam Hyo Cho, Changdeo D. Gaikwad, Nagesh Choudhary, Amandeep Sharma
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Publication number: 20190136794Abstract: A piston includes a piston body having an outer cylindrical surface and defined along a longitudinal piston center axis. The piston further includes a piston bowl with a half section profile with a bowl entry extending radially from the longitudinal piston center axis; a bowl recess extending radially from the bowl entry; and a soot shelf extending from the bowl recess to define a soot shelf axial height (H) and a soot shelf radial width (W). The soot shelf includes an inner step being formed by an inner step base surface extending radially from the bowl recess; an outer step being formed by a step shoulder surface extending axially from the inner step base surface and an outer step base surface extending radially from the step shoulder surface; and a soot shelf shoulder surface extending axially from outer step base surface to the end perimeter surface.Type: ApplicationFiled: November 7, 2017Publication date: May 9, 2019Inventors: NAM HYO CHO, CHANGDEO D. GAIKWAD, NAGESH CHOUDHARY, AMANDEEP SHARMA
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Publication number: 20160053712Abstract: A piston having an outer surface and a bottom surface. The bottom surface comprises a convex region, a concave region, and a circumferential edge. The convex region is intersected by a longitudinal piston axis defined by the piston. The convex region is radially inward of and in contact with the concave region, the concave region is radially inward of an in contact with the circumferential edge, and the circumferential edge is radially inward of and in contact with the outer surface.Type: ApplicationFiled: August 19, 2014Publication date: February 25, 2016Inventors: Richard E. Winsor, Nam Hyo Cho
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Publication number: 20160053713Abstract: A piston for use in an engine. The piston includes a sidewall, a bowl, a tapered surface, and an outer surface. The tapered surface is positioned radially outward relative to the bowl, and the outer surface contacts the sidewall and is positioned radially outward relative to the tapered surface. The tapered surface extends between the bowl and the outer surface, such that the tapered surface contacts the bowl at a radially inward location and contacts the outer surface at a radially outward location. The sidewall faces radially outward to mate with a cylinder of the engine.Type: ApplicationFiled: August 19, 2014Publication date: February 25, 2016Inventors: Richard E. Winsor, Nam Hyo Cho
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Patent number: 6880501Abstract: An internal combustion engine that has a pair of cylinders each having a reciprocating piston connected to a crank shaft by a connecting rod. One of the cylinders is adapted for an air and fuel intake and a compression strokes only, and the other of the cylinders adapted for at least power and exhaust strokes. A conduit exists for transfer of gases from the one into the other cylinder after the compression stroke. The conduit has means for isolating gases in the conduit intermediate the compression and power strokes. Furthermore, the conduit is designed to prevent the transfer of liquefied fuel from the one cylinder to the other.Type: GrantFiled: January 29, 2003Date of Patent: April 19, 2005Assignee: Massachusetts Institute of TechnologyInventors: Nam P. Suh, Nam-Hyo Cho
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Patent number: 6789514Abstract: An internal combustion engine that has a pair of cylinders each having a reciprocating piston connected to a crank shaft by a connecting rod. One of the cylinders is adapted for an air and fuel intake and a compression strokes only, and the other of the cylinders adapted for power and exhaust strokes only. A conduit exists for transfer of gases from the one into the other cylinder after the compression stroke. The conduit has means for isolating gases in the conduit intermediate the compression and power strokes. Furthermore, the conduit is designed to prevent the transfer of liquefied fuel from the one cylinder to the other.Type: GrantFiled: July 30, 2002Date of Patent: September 14, 2004Assignee: Massachusetts Institute of TechnologyInventors: Nam P. Suh, Nam-Hyo Cho
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Publication number: 20030230259Abstract: An internal combustion engine that has a pair of cylinders each having a reciprocating piston connected to a crank shaft by a connecting rod. One of the cylinders is adapted for an air and fuel intake and a compression strokes only, and the other of the cylinders adapted for at least power and exhaust strokes. A conduit exists for transfer of gases from the one into the other cylinder after the compression stroke. The conduit has means for isolating gases in the conduit intermediate the compression and power strokes. Furthermore, the conduit is designed to prevent the transfer of liquefied fuel from the one cylinder to the other.Type: ApplicationFiled: January 29, 2003Publication date: December 18, 2003Inventors: Nam P. Suh, Nam-Hyo Cho
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Publication number: 20030019444Abstract: A internal combustion engine that has a pair of cylinders each having a reciprocating piston connected to a crank shaft by a connecting rod. One of the cylinders is adapted for an air and fuel intake and a compression strokes only, and the other of the cylinders adapted for power and exhaust strokes only. A conduit exists for transfer of gases from the one into the other cylinder after the compression stroke. The conduit has means for isolating gases in the conduit intermediate the compression and power strokes. Furthermore, the conduit is designed to prevent the transfer of liquefied fuel from the one cylinder to the other.Type: ApplicationFiled: July 30, 2002Publication date: January 30, 2003Inventors: Nam P. Suh, Nam-Hyo Cho