Patents by Inventor Kyekyoon Kim

Kyekyoon 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: 20240038870
    Abstract: A solution-phase processed vertical Schottky diode comprises a stack of films on a substrate, where the stack of films includes: a first electrode film comprising a noble metal; a first semiconducting film on the first electrode film, where the first semiconducting film comprises zinc oxide doped with an electron donor metal at a first dopant concentration; a second semiconducting film on the first semiconducting film, where the second semiconducting film comprises zinc oxide doped with the electron donor metal at a second dopant concentration higher than the first dopant concentration; and a second electrode film on the second semiconducting film, where the second electrode film comprises a noble metal.
    Type: Application
    Filed: July 28, 2023
    Publication date: February 1, 2024
    Inventors: Kyekyoon KIM, Hyungsoo CHOI, Riley VESTO
  • Publication number: 20230327027
    Abstract: A method of fabricating a power semiconductor device includes forming a bi layer mask on a semiconductor substrate, where the bilayer mask comprises a first dielectric layer on the semiconductor substrate and a second dielectric layer on the first dielectric layer. The first and second dielectric layers are through-etched to define an exposed portion of the semiconductor substrate. The first dielectric layer is selectively etched to form an undercut region of the bi layer mask. A crystalline semiconductor material is epitaxially grown on the exposed portion of the semiconductor substrate, and a polycrystalline semiconductor material is deposited on the second dielectric layer of the bilayer mask. After the epitaxial growth, the bilayer mask and the polycrystalline semiconductor material are removed from the semiconductor substrate, leaving behind a mesa comprising the crystalline semiconductor material on the semiconductor substrate.
    Type: Application
    Filed: July 30, 2021
    Publication date: October 12, 2023
    Applicant: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Palash Sarker, Frank P. Kelly
  • Patent number: 11471419
    Abstract: Provided is a microcapsule for increasing the survival and/or function of a cell, such as an islet cell, microcapsule can include an outer shell comprising a first polymer; an interior core comprising: at least one live cell; a second polymer; and at least one microsphere comprising a third polymer and a compound capable of improving survival of the at least one cell. The improved survival and/or function of the at least one live cell in the microcapsule is compared to a live cell in a microcapsule in the absence of the compound capable of improving survival of the at least one cell. The first and second polymer may include alginate and the third polymer (used for the microsphere) may comprise PLGA. The compound may include a GLP-1 receptor agonist. Also provided are methods for producing such microcapsules; insulin delivery systems using the microcapsules, and methods to treat disease, such as diabetes, using the microcapsules.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: October 18, 2022
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Publication number: 20210322326
    Abstract: Particles for delivery of therapeutic agents are disclosed. In one embodiment, a particle for delivery of a therapeutic agent includes a hydrogel polymer matrix, a plurality of hydrophobic encapsulation sites within the hydrogel polymer matrix, and a hydrophobic therapeutic agent encapsulated within at least some of the encapsulation sites. The hydrogel polymer matrix may be hydrophilic. The hydrophobic encapsulation sites may comprise cyclodextrin conjugated to the hydrogel polymer matrix. The hydrogel polymer matrix comprises gelatin. The particle may have a diameter of 10 nm to 50 ?m.
    Type: Application
    Filed: April 16, 2021
    Publication date: October 21, 2021
    Inventors: Hyungsoo CHOI, Kyekyoon KIM
  • Publication number: 20180092855
    Abstract: Provided is a microcapsule for increasing the survival and/or function of a cell, such as an islet cell, microcapsule can include an outer shell comprising a first polymer; an interior core comprising: at least one live cell; a second polymer; and at least one microsphere comprising a third polymer and a compound capable of improving survival of the at least one cell. The improved survival and/or function of the at least one live cell in the microcapsule is compared to a live cell in a microcapsule in the absence of the compound capable of improving survival of the at least one cell. The first and second polymer may include alginate and the third polymer (used for the microsphere) may comprise PLGA. The compound may include a GLP-1 receptor agonist. Also provided are methods for producing such microcapsules; insulin delivery systems using the microcapsules, and methods to treat disease, such as diabetes, using the microcapsules.
    Type: Application
    Filed: September 29, 2017
    Publication date: April 5, 2018
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Publication number: 20180070586
    Abstract: Provided is a lyoprotected microcapsule for increasing the survival of a microorganism, such as Pantoea agglomerans E325, after lyophilization and/or storage, which includes an interior core having at least one live microorganism; a first polymer; and at least one nutrient, as well as an exterior shell having second polymer. The lyoprotected microcapsule also includes at least one lyoprotective agent. The polymer may include alginate and the lyoprotective agent may include maltodextrin, trehalose and combinations thereof. Microorganisms within the lyoprotected microcapsules exhibit enhanced survival after lyophilization and/or storage. Also provided are methods for producing such lyoprotected microcapsules and methods for using the lyoprotected microcapsules.
    Type: Application
    Filed: August 18, 2017
    Publication date: March 15, 2018
    Applicant: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon KIM, Hyungsoo CHOI, In-Yong KIM
  • Patent number: 8663511
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, a method for applying a force to at least one of an inner stream, an outer stream or both of a combined stream to produce a plurality of capsules, receiving image data, processing the image data, detecting undesirable capsules from the processed image data, applying a bias charge only to the detected undesirable capsules, and segregating the biased undesirable capsules from the unbiased desirable capsules. Additional embodiments are disclosed.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: March 4, 2014
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Patent number: 8507048
    Abstract: The subject disclosure provides a method for applying dissimilar electrical charges to portions of a plurality of applicators by way of a conductor included in a conduit of each applicator. The method further includes causing each applicator to generate one or more jet sprays of a liquid received by each applicator for application of a material on a substrate, where one or more portions of the material on the substrate have one or more net charges associated with the dissimilar electrical charges applied to the portions of the plurality of applicators, where the conductor of each applicator is a sleeve positioned in the applicator, and where a diameter of the sleeve results in one of an outer surface of the sleeve contacting a surface of the conduit, or the outer surface of the sleeve having a separation from the surface of the conduit of the applicator. Additional embodiments are disclosed.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: August 13, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Patent number: 8469762
    Abstract: A high intensity discharge arc lamp comprises an arc tube, a metal halide in the arc tube, and a coating on the arc tube. The coating comprises a UV absorbent material.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: June 25, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Ju Gao, Hyungsoo Choi, Ravindra Pratap Singh
  • Patent number: 8409621
    Abstract: A method of forming particles, comprises accelerating a first stream comprising a first liquid, applying a charging voltage of at most 1.5 kV to the first stream, and vibrating the first stream, to form particles.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: April 2, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi, Young Bin Choy
  • Patent number: 8342120
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having a tube with an ingress opening to receive a liquid, and an egress opening to release the liquid, a conductor positioned in a conduit of the tube, the conductor and the conduit having dimensions to cause a surface tension of the liquid to prevent a constant flow of the liquid from the egress opening, and a power supply coupled to the conductor to apply a charge to the liquid to overcome the surface tension and form at the egress opening a single jet stream of the liquid applicable on a substrate to create a pattern. The single jet stream can be controllable in part by a viscosity of the liquid. Additional embodiments are disclosed.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: January 1, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi, Philip Edward Heil, III
  • Patent number: 8293271
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having an outer nozzle operable to discharge an outer stream of a shell solution, and an inner nozzle operable to discharge an inner stream of a core solution intermixed with a plurality of materials. The outer stream can substantially surrounds the inner stream, thereby forming a combined stream. A plurality of capsules can be formed responsive to a force applied to the combined stream. At least a portion of the plurality of capsules are desirable capsules, each having a core encapsulated by a portion of the shell solution. The core can have at least one of the plurality of materials encapsulated by a portion of the core solution without protruding an outer surface of the portion of the shell solution. Additional embodiments are disclosed.
    Type: Grant
    Filed: June 9, 2009
    Date of Patent: October 23, 2012
    Assignee: The Board of Trustees of The University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Publication number: 20110311731
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having a plurality of applicators, each applicator with an ingress opening to receive a liquid, and an egress opening to release the liquid, and a conductor positioned in a conduit of each of the plurality of applicators, the conductor and the conduit having dimensions to cause a surface tension of the liquid to prevent a constant flow of the liquid from the egress opening. Each conductor of the plurality of applicators can be coupled to one of one or more power sources operable to apply a charge to the liquid to overcome the surface tension and form at the egress opening of each applicator a plurality of jet sprays of the liquid applicable on a substrate to form a thin film. Additional embodiments are disclosed.
    Type: Application
    Filed: August 26, 2011
    Publication date: December 22, 2011
    Applicant: THE BOARD OF TRUSTEES OF THE UNIVIERSITY OF ILLINOIS
    Inventors: KYEKYOON KIM, Hyungsoo Choi
  • Patent number: 8030833
    Abstract: One embodiment includes forming a nanowire on a substrate from an organometallic vapor. The nanowire is grown during this formation in a direction away from the substrate and is freestanding during growth. The nanowire has a first dimension of 500 nanometers or less and a second dimension extending from the substrate to a free end of the nanowire at least 10 times greater than the first dimension. In one form, the organometallic vapor includes copper, silver, or gold. Alternatively or additionally, the nanowire is of a monocrystalline structure.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: October 4, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Hyungsoo Choi, Kyekyoon Kim
  • Patent number: 8025025
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having a plurality of applicators, each applicator with an ingress opening to receive a liquid, and an egress opening to release the liquid, and a conductor positioned in a conduit of each of the plurality of applicators, the conductor and the conduit having dimensions to cause a surface tension of the liquid to prevent a constant flow of the liquid from the egress opening. Each conductor of the plurality of applicators can be coupled to one of one or more power sources operable to apply a charge to the liquid to overcome the surface tension and form at the egress opening of each applicator a plurality of jet sprays of the liquid applicable on a substrate to form a thin film. Additional embodiments are disclosed.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: September 27, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Publication number: 20100301730
    Abstract: A high intensity discharge arc lamp comprises an arc tube, a metal halide in the arc tube, and a coating on the arc tube. The coating comprises a UV absorbent material.
    Type: Application
    Filed: May 22, 2008
    Publication date: December 2, 2010
    Applicant: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Ju Gao, Hyungsoo Choi, Ravindra P. Singh
  • Patent number: 7748343
    Abstract: An electrohydrodynamic spray apparatus includes a liquid inlet and a spray nozzle in fluid communication with the liquid inlet, where the spray nozzle has an opening downstream of the liquid inlet. An inner electrode is situated at least partially inside the spray nozzle. An outer electrode is situated external to the spray nozzle and within about 100 mm of the opening of the nozzle. The electrohydrodynamic spray apparatus can be combined with a substrate to form an electrohydrodynamic spray system. The electrohydrodynamic spray apparatus or system can be used to form nanostructures such as nanodrops, nanoparticles and thin films.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: July 6, 2010
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kyekyoon Kim, Ravindra Pratap Singh
  • Publication number: 20090304788
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having an outer nozzle operable to discharge an outer stream of a shell solution, and an inner nozzle operable to discharge an inner stream of a core solution intermixed with a plurality of materials. The outer stream can substantially surrounds the inner stream, thereby forming a combined stream. A plurality of capsules can be formed responsive to a force applied to the combined stream. At least a portion of the plurality of capsules are desirable capsules, each having a core encapsulated by a portion of the shell solution. The core can have at least one of the plurality of materials encapsulated by a portion of the core solution without protruding an outer surface of the portion of the shell solution. Additional embodiments are disclosed.
    Type: Application
    Filed: June 9, 2009
    Publication date: December 10, 2009
    Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Kyekyoon Kim, Hyungsoo Choi
  • Publication number: 20090258153
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having a plurality of applicators, each applicator with an ingress opening to receive a liquid, and an egress opening to release the liquid, and a conductor positioned in a conduit of each of the plurality of applicators, the conductor and the conduit having dimensions to cause a surface tension of the liquid to prevent a constant flow of the liquid from the egress opening. Each conductor of the plurality of applicators can be coupled to one of one or more power sources operable to apply a charge to the liquid to overcome the surface tension and form at the egress opening of each applicator a plurality of jet sprays of the liquid applicable on a substrate to form a thin film. Additional embodiments are disclosed.
    Type: Application
    Filed: April 10, 2009
    Publication date: October 15, 2009
    Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: KYEKYOON KIM, HYUNGSOO CHOI
  • Publication number: 20090230222
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, an apparatus having a tube with an ingress opening to receive a liquid, and an egress opening to release the liquid, a conductor positioned in a conduit of the tube, the conductor and the conduit having dimensions to cause a surface tension of the liquid to prevent a constant flow of the liquid from the egress opening, and a power supply coupled to the conductor to apply a charge to the liquid to overcome the surface tension and form at the egress opening a single jet stream of the liquid applicable on a substrate to create a pattern. The single jet stream can be controllable in part by a viscosity of the liquid. Additional embodiments are disclosed.
    Type: Application
    Filed: March 16, 2009
    Publication date: September 17, 2009
    Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: KYEKYOON KIM, Hyungsoo Choi, Philip Edward Heil