Patents by Inventor Chang H. Kim

Chang H. Kim 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).

  • Publication number: 20200354778
    Abstract: The present invention relates to the rapid and electricity-free, point-of-care, multiplexed detection and quantification of at least one or more nucleic acid sequences from nucleic acids corresponding to a plurality of pathogens or biomarkers using a micropatterned lateral flow device. Rapid and molecular-level sensitive differential diagnosis of a disease condition may be enabled without the need for a delayed laboratory test so that timely treatment can be administered.
    Type: Application
    Filed: July 28, 2020
    Publication date: November 12, 2020
    Applicants: GODX, INC, THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY, DEPARTMENT OF HEALTH & HUMAN SERVICES
    Inventors: Chang Hee Kim, Wendy A. Henderson, Sarah K. Abey, Nicolaas H. Fourie, Eric G. Ferguson
  • Publication number: 20200009396
    Abstract: The present application relates to a medical light diffusion implant and, more specifically, to a functional implant to emit medical lights so as to induce rapid recovery after an implantation. According to the present invention, A medical light diffusion implant, comprising a socket including a space therein, capable of being fixed to a living body and a crown coupled with the socket so as to seal the socket, wherein the socket is transmittable by lights, and comprises a light source unit included at an inner space of the socket and the crown coupled to each other, to emit the lights.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 9, 2020
    Inventors: Chang H. Huh, David C. Suh, Debbie H. Kim, Soon H. Lee
  • Patent number: 10040029
    Abstract: A method is disclosed of providing a fuel efficient regeneration of an exhaust after-treatment (AT) system that includes a lean oxides of nitrogen (NOX) trap (LNT) and a selective catalytic reduction filter (SCRF) positioned downstream of the LNT. The method includes regulating a selectable position valve. The valve permits a first gas flow portion to pass through the LNT and diverts a remaining second portion of exhaust gas flow from a first passage connecting an engine and the AT system to a second exhaust passage to thereby bypass the LNT. The method also includes regulating a first device to inject fuel into the first portion of the exhaust gas flow. The injection of fuel in to the first portion of the exhaust gas flow provides fuel efficient regeneration of the LNT and promotes NOX conversion and ammonia (NH3) formation in the LNT. A system employing the method is also disclosed.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: August 7, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Rahul Mital, Jianwen Li, Andrea De Filippo, Chang H Kim, Shouxian Ren
  • Patent number: 9879587
    Abstract: A method for diagnosing an Oxidation Catalyst (OC) device of an exhaust gas treatment system is provided. The method monitors a differential temperature across the OC device. The method determines whether the differential temperature reveals a temperature spike. The method determines that the OC device operates properly in response to determining that the differential temperature reveals a temperature spike.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: January 30, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Chang H. Kim, Michelle H. Wiebenga, Vincent J. Tylutki, David B. Brown, Igor Anilovich, Rahul Mital
  • Patent number: 9732687
    Abstract: A method for removing NOX from an oxygen-rich exhaust flow produced by a combustion source that is combusting a lean mixture of air and fuel may include passing the oxygen-rich exhaust flow through an exhaust aftertreatment system that includes a NOX oxidation catalyst that includes perovskite oxide particles, a NOX storage catalyst, and a NOX reduction catalyst.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: August 15, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Wei Li, David B. Brown, Chang H Kim, Gongshin Qi, Steven J. Schmieg
  • Patent number: 9714625
    Abstract: A system according to the principles of the present disclosure includes an air/fuel ratio determination module and an emission level determination module. The air/fuel ratio determination module determines an air/fuel ratio based on input from an air/fuel ratio sensor positioned downstream from a three-way catalyst that is positioned upstream from a selective catalytic reduction (SCR) catalyst. The emission level determination module selects one of a predetermined value and an input based on the air/fuel ratio. The input is received from a nitrogen oxide sensor positioned downstream from the three-way catalyst. The emission level determination module determines an ammonia level based on the one of the predetermined value and the input received from the nitrogen oxide sensor.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: July 25, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Min Sun, Kevin L. Perry, Donovan L. Dibble, Chang H. Kim, Mary Beth Furness
  • Publication number: 20170114696
    Abstract: A method for diagnosing an Oxidation Catalyst (OC) device of an exhaust gas treatment system is provided. The method monitors a differential temperature across the OC device. The method determines whether the differential temperature reveals a temperature spike. The method determines that the OC device operates properly in response to determining that the differential temperature reveals a temperature spike.
    Type: Application
    Filed: October 23, 2015
    Publication date: April 27, 2017
    Inventors: Chang H. Kim, Michelle H. Wiebenga, Vincent J. Tylutki, David B. Brown, Igor Anilovich, Rahul Mital
  • Patent number: 9376948
    Abstract: A method of treating an exhaust gas produced by a vehicle internal combustion engine includes conveying the gas through a first reactor including a non-thermal plasma. The gas includes nitric oxide and is transitionable between a first condition in which the gas has a cold-start temperature that is less than or equal to about 150° C., and a second condition in which the gas has an operating temperature that is greater than about 150° C. During the first condition, the method includes contacting the gas and plasma to oxidize the nitric oxide to nitrogen dioxide and form an effluent that includes nitrogen dioxide. The method includes concurrently conveying the effluent through a second reactor including a diesel oxidation catalyst, and storing the nitrogen dioxide within the second reactor during only the first condition. The method includes, after storing, releasing nitrogen dioxide from the second reactor during only the second condition.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: June 28, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Chang H. Kim, Steven J. Schmieg, Eugene V. Gonze, Michael J. Paratore, Jr.
  • Patent number: 9255537
    Abstract: A palladium-only (i.e., platinum free) oxidation catalyst body is used to oxidize carbon monoxide and hydrocarbons in the exhaust stream of a diesel engine powered vehicle, which is operated at a fuel-lean air-to-fuel ratio (A/F) for much of the time it powers a vehicle. Periodically, a recent history of the temperatures of the exhaust gas at the inlet to the palladium oxidation catalyst body is prepared in a computer control module. And a recent history of the A/F of the operating engine is considered. These temperature and A/F values are then used in determining whether the engine should be temporarily operated in a fuel-rich or stoichiometric A/F mode to provide an exhaust gas composition suitable for rejuvenation of the palladium by reducing its oxide formed during lean operation of the engine.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: February 9, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Chang H. Kim, Michelle H. Wiebenga, Eugene V. Gonze
  • Patent number: 9181843
    Abstract: The capacity of a platinum-containing diesel oxidation catalyst (DOC) to simultaneously convert NO to NO2, CO to carbon dioxide, and remaining hydrocarbons to carbon dioxide and water in the exhaust system of a vehicle diesel engine may be evaluated and diagnosed using measured DOC exhaust inlet temperatures and outlet temperatures at a relatively high exhaust temperature and, soon thereafter, at a relatively low exhaust inlet temperature. Values of the platinum-containing DOC exotherms at the high and low DOC inlet temperatures are found to provide a basis for evaluation of both NO conversion and the HC and CO conversion capabilities of the DOC. The process may be repeated as the catalyzed DOC conversion efficiency changes with use. The practice may also be used to evaluate the performance of oxidation catalysts used in a like way in treating the exhaust from a lean-burn gasoline engine.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: November 10, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Chang H. Kim, Janean E. Kowalkowski, David N. Belton, Steven J. Schmieg
  • Patent number: 9140170
    Abstract: A system and method is provided for enhancing the performance of an SCR device, particularly by routinely reducing the amount of reductant deposits accumulated in an exhaust gas system, when the reductant is injected at a reduced temperature. The system may include an engine, an exhaust gas system, an SCR device, an injection device, and a controller configured to execute the present method. The controller may be configured to select an initial injection rate and an initial injection temperature for the reductant; estimate the amount of accumulated reductant deposits present within the exhaust gas system; compare the amount of accumulated reductant deposits to a threshold amount of reductant deposits allowable in the exhaust gas system; and initiate a reductant deposit burn-off mode when the amount of accumulated reductant deposits is greater than the threshold amount of reductant deposits allowable in the exhaust gas system.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: September 22, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Rahul Mital, Jianwen Li, Justin Adam Shetney, Chang H. Kim, Matthew J. Myers
  • Patent number: 9138686
    Abstract: Particles of mixed oxides of cerium, zirconium, and copper (CeZrCuOX) may be prepared as catalysts and used to preferentially catalyze the oxidation of CO in exhaust streams containing CO and NH3. In one practice, this CeZrCuOX catalyst may be used in combination with a close-coupled PGM catalyst which promotes the formation of NH3 in the exhaust during fuel-rich operation, and at least one under-floor NH3-SCR catalyst, which catalyzes the reduction of NOX in the exhaust stream during fuel-lean operation using NH3 as a reductant. During fuel-rich engine operation, the exhaust stream may be doped with oxygen downstream of the PGM catalyst and passed in contact with particles of the CeZrCuOX catalyst so that residual CO in the exhaust may be oxidized to CO2, without oxidation or other conversion of the NH3.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: September 22, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Chang H Kim, Gongshin Qi
  • Publication number: 20150238903
    Abstract: A method is disclosed of providing a fuel efficient regeneration of an exhaust after-treatment (AT) system that includes a lean oxides of nitrogen (NOX) trap (LNT) and a selective catalytic reduction filter (SCRF) positioned downstream of the LNT. The method includes regulating a selectable position valve. The valve permits a first gas flow portion to pass through the LNT and diverts a remaining second portion of exhaust gas flow from a first passage connecting an engine and the AT system to a second exhaust passage to thereby bypass the LNT. The method also includes regulating a first device to inject fuel into the first portion of the exhaust gas flow. The injection of fuel in to the first portion of the exhaust gas flow provides fuel efficient regeneration of the LNT and promotes NOX conversion and ammonia (NH3) formation in the LNT. A system employing the method is also disclosed.
    Type: Application
    Filed: February 25, 2014
    Publication date: August 27, 2015
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Rahul Mital, Jianwen Li, Andrea De Filippo, Chang H. Kim, Shouxian Ren
  • Patent number: 9084966
    Abstract: A method of determining aging of a diesel oxidation catalyst (DOC) in an engine exhaust system includes receiving a first sensor signal from a first nitrogen oxides (NOx) sensor positioned in exhaust flow upstream of the DOC. The first sensor signal is indicative of an amount of NOx in the exhaust flow upstream of the DOC. The method further includes receiving a second sensor signal from a second NOx sensor positioned in exhaust flow downstream of the DOC. The second sensor signal is indicative of an amount of NOx downstream of the DOC. A difference between the first sensor signal and the second sensor signal is calculated via a controller. A DOC aging level based on a predetermined correlation between the difference and DOC aging is then determined by the controller.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: July 21, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Raffaello Ardanese, Vincent J Tylutki, Christopher P Musienko, Shouxian Ren, Chang H Kim
  • Patent number: 9021793
    Abstract: A vehicle includes an internal combustion engine operatively disposed therein. The engine generates exhaust gases. The vehicle further includes an alternator operatively connected to the engine. The alternator produces DC power. An ultracapacitor is operatively connected to the alternator to receive electrical energy therefrom. The vehicle still further includes an exhaust gas treatment system operatively connected to the engine to receive exhaust gases therefrom. The exhaust gas treatment system includes an electrically heated catalyst (EHC) device electrically connected to the ultracapacitor to selectively heat a catalytic exhaust system component. The ultracapacitor stores energy converted by the alternator from vehicle kinetic energy and releases the stored energy to heat the EHC.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: May 5, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Chang H. Kim, Eugene V. Gonze, Chandra S. Namuduri, Kenneth J. Shoemaker
  • Patent number: 9016045
    Abstract: An exhaust gas treatment system for an internal combustion engine is provided and includes an exhaust gas conduit, a generator, an electrically heated catalyst (“EHC”) device, and a control module. The exhaust gas conduit is in fluid communication with, and is configured to receive an exhaust gas from the internal combustion engine. The generator operates at a generator speed to produce electrical power. The EHC device is in fluid communication with the exhaust gas conduit. The EHC device includes a monolith structure that is divided into a plurality of segments that define discrete resistive paths. The resistive paths are selectively connected to the generator for receiving electrical power. The control module is in communication with the EHC device, the generator, and the internal combustion engine. The control module includes control logic for determining the generator speed.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: April 28, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Eugene V. Gonze, Michael J. Paratore, Jr., Chang H. Kim, Charles E. Solbrig
  • Patent number: 9016047
    Abstract: In one embodiment, a method for controlling nitrogen oxides in an exhaust gas received by an exhaust system, the exhaust system including a first selective catalytic reduction device, an exhaust gas heat recovery device and a second selective catalytic reduction device is provided. The method includes flowing the exhaust gas from an internal combustion engine into the first selective catalytic reduction device, receiving the exhaust gas from the first selective catalytic reduction device into the exhaust gas heat recovery device and directing the exhaust gas to a heat exchanger in the exhaust gas heat recovery device based on a temperature of the internal combustion engine proximate moving engine components. The method includes adsorbing nitrogen oxides from the exhaust gas via a nitrogen oxide adsorbing catalyst disposed in the heat exchanger and flowing the exhaust gas from the exhaust gas heat recovery device into the second selective catalytic reduction device.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: April 28, 2015
    Assignee: GM Global Technologies Operations LLC
    Inventors: Eugene V. Gonze, Chang H. Kim, Michael J. Paratore, Jr., George M. Claypole
  • Patent number: 8997464
    Abstract: A waste heat recovery system with an integrated hydrocarbon adsorber for a vehicle having an internal combustion engine that generates exhaust gas containing hydrocarbons, and a catalytic converter, includes an exhaust gas conduit, an exhaust gas heat exchanger, a heat exchanger bypass valve, a coolant circuit with a coolant bypass and a coolant bypass valve, and a controller. The exhaust gas heat exchanger includes at least one channel through which the exhaust gas is flowable, the channel having an interior surface coated with a hydrocarbon adsorbing material configured to adsorb hydrocarbons. The heat exchanger and coolant bypass valves are configured to selectively direct at least a portion of the exhaust gas and the coolant, respectively, to the exhaust gas heat exchanger or to bypass it. They are controlled by the controller such that the hydrocarbons in the exhaust gas are selectively adsorbable by and desorbable from the coating.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: April 7, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Halim G. Santoso, Eugene V. Gonze, Chang H. Kim
  • Patent number: 8984870
    Abstract: Following a cold start of a hydrocarbon-fueled engine operated in a lean-burn-combustion mode, several seconds and minutes may be required for the exhaust gas stream to heat exhaust treatment devices in the exhaust system and conduit to their effective operating temperatures. The warm-up period may be particularly long for a NOx reduction catalyst (SCR) located downstream in the exhaust flow system. Accordingly, a bed of absorbent material, such as a suitably sized bed of alumina particles, located upstream of the SCR, is used to temporarily absorb water and NOx from a relatively cold exhaust until the exhaust has suitably heated the SCR to its operating temperature. Then, the warmed exhaust will remove the water and NOx from their temporary storage material and carry them to the reduction catalyst.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: March 24, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Steven J. Schmieg, Chang H Kim, Wei Li
  • Publication number: 20150059317
    Abstract: A system and method is provided for enhancing the performance of an SCR device, particularly by routinely reducing the amount of reductant deposits accumulated in an exhaust gas system, when the reductant is injected at a reduced temperature. The system may include an engine, an exhaust gas system, an SCR device, an injection device, and a controller configured to execute the present method. The controller may be configured to select an initial injection rate and an initial injection temperature for the reductant; estimate the amount of accumulated reductant deposits present within the exhaust gas system; compare the amount of accumulated reductant deposits to a threshold amount of reductant deposits allowable in the exhaust gas system; and initiate a reductant deposit burn-off mode when the amount of accumulated reductant deposits is greater than the threshold amount of reductant deposits allowable in the exhaust gas system.
    Type: Application
    Filed: August 27, 2013
    Publication date: March 5, 2015
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Rahul Mital, Jianwen Li, Justin Adam Shetney, Chang H. Kim, Matthew J. Myers