Patents by Inventor Hyun Gil Cha

Hyun Gil Cha 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).

  • Patent number: 12269922
    Abstract: A method for preparing an aramid nanofiber dispersion includes dissolving an aromatic polyamide-based polymer in a solution including a basic material and an aprotic polar solvent, while performing stirring so that a nanofiber is produced, wherein the aromatic polyamide-based polymer is a polymer in a form of a solid which is not spun into a fiber form, the stirring is performed at a temperature of 50° C. or lower and at a speed of 10-1000 rpm so that a time taken for the aromatic polyamide-based polymer to be dissolved and formed into an aramid nano-fiber dispersion is 80 hours or less, an aramid nanofiber in the aramid nanofiber dispersion has an average diameter of 1 to 100 nm and an average length of 0.1 to 100 ?m, and the basic material includes potassium hydroxide or sodium hydroxide.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: April 8, 2025
    Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Jeyoung Park, Dong Yeop Oh, Sung Yeon Hwang, Hyun Gil Cha, Jong Geon Jegal, Ho Jun Kim, Seul A Park
  • Publication number: 20220177668
    Abstract: The present invention pertains to a method for producing high value-added compounds from polyethylene terephthalate. More specifically, the present invention demonstrates that a monomeric terephthalic acid obtained from the chemical hydrolysis of polyethylene terephthalate can be converted to high value-added aromatic compounds and aromatic-derived compounds, and ethylene glycol, which is another monomer of polyethylene terephthalate, can be converted to glycolic acid, which is a cosmetic material. The present invention is characterized by recycling polyethylene terephthalate waste into high value-added compounds.
    Type: Application
    Filed: April 8, 2020
    Publication date: June 9, 2022
    Applicants: Korea University Research and Business Foundation, EWHA UNIVERSITY - INDUSTRY COLLABORATION FOUNDATION
    Inventors: Kyoung Heon KIM, Jeong Chan JOO, Hee Taek KIM, Si Jae PARK, Hyun Gil CHA, Bong Keun SONG, Jae Kyun KIM
  • Patent number: 11136679
    Abstract: Photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: October 5, 2021
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha
  • Publication number: 20210238348
    Abstract: The present disclosure relates to a method for preparing an aramid nanofiber dispersion. More specifically, the present invention relates to a method for preparing aramid nanofibers in a short time from aromatic polyamide-based polymers other than fibers, and to aramid nanofibers prepared therefrom.
    Type: Application
    Filed: March 19, 2019
    Publication date: August 5, 2021
    Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Jeyoung PARK, Dong Yeop OH, Sung Yeon HWANG, Hyun Gil CHA, Jong Geon JEGAL, Ho Jun KIM, Seul A PARK
  • Publication number: 20200255960
    Abstract: Photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Application
    Filed: April 9, 2020
    Publication date: August 13, 2020
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha
  • Patent number: 10655233
    Abstract: Electrochemical and photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: May 19, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha
  • Publication number: 20170145572
    Abstract: Electrochemical and photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Application
    Filed: February 1, 2017
    Publication date: May 25, 2017
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha
  • Patent number: 9598780
    Abstract: Electrochemical and photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: March 21, 2017
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha
  • Publication number: 20160201204
    Abstract: Electrochemical and photoelectrochemical cells for the oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran are provided. Also provided are methods of using the cells to carry out the electrochemical and photoelectrochemical oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and/or 2,5-diformylfuran.
    Type: Application
    Filed: January 8, 2015
    Publication date: July 14, 2016
    Inventors: Kyoung-Shin Choi, Hyun Gil Cha