Patents by Inventor Chul-Hwan Kim

Chul-Hwan 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).

  • Adaptive reclosing method using variable dead time control algorithm in power transmission line
    Patent number: 6768620
    Abstract: Disclosed in an adaptive reclosing method using a variable dead time control algorithm in a power transmission line. The method is used to remove faults induced by a circuit breaker being operated by a protective relay and to reclose the circuit breaker after a dead time following faults occurring, thereby automatically and promptly re-establishing power transmission in the network and reliably maintaining the power supply by the transmission system.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: July 27, 2004
    Assignee: Sungkyunkwan University
    Inventors: Chul-Hwan Kim, Sang-Pil Ahn
  • Adaptive reclosing method using variable dead time control in power transmission line
    Publication number: 20040027747
    Abstract: The present invention relates to an adaptive reclosing method by using a dead time control in a power transmission line.
    Type: Application
    Filed: July 18, 2002
    Publication date: February 12, 2004
    Applicant: SUNGKYUNKWAN UNIVERSITY
    Inventors: Chul-Hwan Kim, Sang-Pil Ahn
  • Micro-serrated, dyed color toner particles and method of making same
    Patent number: 6544705
    Abstract: A color toner composition includes dyed toner resin particles having a volume average diameter in the range of from about 2 microns to about 10 microns with a size distribution span value of less than 1.0. Preferred particles are characterized further by a micro-serrated surface exhibiting a roughness index value larger than about 1.2. The resin toner particles are prepared utilizing a dye-mediating co-solvent which facilitates transfer from a dispersion medium to the resin particles.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: April 8, 2003
    Assignee: DPI Solutions, Inc.
    Inventors: Chul-Hwan Kim, Eui-Jun Choi, Tae-Ho Park, Seok-Jin Kim, Hyun-Nam Yoon
  • Micro-serrated particles for use in color toner and method of making same
    Patent number: 6531255
    Abstract: A particulate composition suitable for making color toner includes resin particles optionally containing a charge control agent. The particles are characterized by a micro-serrated surface exhibiting a surface roughness index of at least about 1.2 and preferably higher. A process for making the particulate composition utilizes a vaporizable plasticizer.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: March 11, 2003
    Assignee: DPI Solutions, Inc.
    Inventors: Chul-Hwan Kim, Seung-Wook Lim, Tae-Ho Park, Hyun-Nam Yoon
  • Micro-serrated, dyed color toner particles and method of making same
    Publication number: 20020182527
    Abstract: A color toner composition includes dyed toner resin particles having a volume average diameter in the range of from about 2 microns to about 10 microns with a size distribution span value of less than 1.0. Preferred particles are characterized further by a micro-serrated surface exhibiting a roughness index value larger than about 1.2. The resin toner particles are prepared utilizing a dye-mediating co-solvent which facilitates transfer from a dispersion medium to the resin particles.
    Type: Application
    Filed: May 18, 2001
    Publication date: December 5, 2002
    Inventors: Chul-Hwan Kim, Eui-Jun Choi, Tae-Ho Park, Seok-Jin Kim, Hyun-Nam Yoon
  • Micro-serrated particles for use in color toner and method of making same
    Publication number: 20020172881
    Abstract: A particulate composition suitable for making color toner includes resin particles optionally containing a charge control agent. The particles are characterized by a micro-serrated surface exhibiting a surface roughness index of at least about 1.2 and preferably higher. A process for making the particulate composition utilizes a vaporizable plasticizer.
    Type: Application
    Filed: May 18, 2001
    Publication date: November 21, 2002
    Inventors: Chul-Hwan Kim, Seung-Wook Lim, Tae-Ho Park, Hyun-Nam Yoon
  • Micro-serrated color toner particles and method of making same
    Patent number: 6461783
    Abstract: A particulate toner composition is provided with toner resin particles containing a resin component, a colorant component, and optionally a charge control agent characterized in that the toner resin particles have a micro-serrated surface exhibiting a surface roughness index of greater than about 1.2. The novel toner particles are produced by employing a vaporizable plasticizer which is flashed off during processing.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: October 8, 2002
    Assignee: DPI Solutions, Inc.
    Inventors: Chul-Hwan Kim, Seung-Wook Lim, Jongkwan Kim, Hyun-Nam Yoon
  • Process for preparing virus-resistant transgenic plant
    Patent number: 5656466
    Abstract: The present invention provides a process for preparing a transgenic plant producing antiviral protein, which is transformed with a recombinant vector for Phytolacca insularis antiviral protein(PIP) expression. In accordance with the present invention, a recombinant expression vector for Phytolacca insularis antiviral protein made a grant of broad vital-resistance to transgenic plant transformed therewith, grounded on the expression of PIP.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: August 12, 1997
    Assignee: Jinro Limited
    Inventors: Young-Ho Moon, Kyu-Whan Choi, Hong-Seob Jeon, Chul-Hwan Kim, Man-Keun Kim