Patents by Inventor Chang Joon KEUM

Chang Joon KEUM 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: 10067104
    Abstract: The present invention relates to a hydrogel bead for detecting hydrofluoric acid and a kit comprising the same, and more particularly, to a hydrogel bead capable of detecting hydrofluoric acid using an organometallic ligand compound that reversibly changes color depending on the concentration of hydrofluoric acid when coming into contact with hydrofluoric acid, and to a kit for detecting hydrofluoric acid comprising the same. In an embodiment, a method for preparing a hydrogel bead for detecting hydrofluoric acid comprises the steps of: mixing an organic compound, which contains an aromatic functional group having at least one hydroxyl group bonded thereto, with a solution of a metal-ligand compound that bonds with the organic compound, thereby preparing a mixed solution; dropping the mixed solution onto a gelling agent; and adding coagulating agent to the mixture resulting from the dropping step to form a porous bead.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: September 4, 2018
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION YONSEI UNIVERSITY
    Inventors: Sang Yup Lee, Chaemyeong Lee, Min Chul Kim, Jin Young Kwak, Sang Woo Park, Young Jun Lim, Chang Joon Keum
  • Publication number: 20160146739
    Abstract: The present invention relates to a hydrogel bead for detecting hydrofluoric acid and a kit comprising the same, and more particularly, to a hydrogel bead capable of detecting hydrofluoric acid using an organometallic ligand compound that reversibly changes color depending on the concentration of hydrofluoric acid when coming into contact with hydrofluoric acid, and to a kit for detecting hydrofluoric acid comprising the same. In an embodiment, a method for preparing a hydrogel bead for detecting hydrofluoric acid comprises the steps of: mixing an organic compound, which contains an aromatic functional group having at least one hydroxyl group bonded thereto, with a solution of a metal-ligand compound that bonds with the organic compound, thereby preparing a mixed solution; dropping the mixed solution onto a gelling agent; and adding coagulating agent to the mixture resulting from the dropping step to form a porous bead.
    Type: Application
    Filed: April 22, 2015
    Publication date: May 26, 2016
    Inventors: Sang Yup LEE, Chaemyeong LEE, Min Chul KIM, Jin Young KWAK, Sang Woo PARK, Young Jun LIM, Chang Joon KEUM