Patents by Inventor Gyeong Ha CHOI

Gyeong Ha CHOI 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).

  • Method for manufacturing diisocyanate and optical lens
    Patent number: 12146023
    Abstract: Provided is a method for manufacturing diisocyanate and an optical lens in which, during the manufacture of diisocyanate from diamine via diamine hydrochloride, use is made of an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid-phase triphosgen instead of phosgen gas while reaction conditions are controlled, whereby the diisocyanate of high quality can be manufactured at excellent yield, with the causation of less environmental problems.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: November 19, 2024
    Assignee: WOORI FINE CHEM CO., LTD.
    Inventors: Dal Seong Kim, Oh Joon Kwon, Sung Gi Lee, Gyeong Ha Choi, Junghwan Shin
  • METHOD FOR MANUFACTURING DIISOCYANATE AND OPTICAL LENS
    Publication number: 20210230352
    Abstract: Provided is a method for manufacturing diisocyanate and an optical lens in which, during the manufacture of diisocyanate from diamine via diamine hydrochloride, use is made of an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid-phase triphosgen instead of phosgen gas while reaction conditions are controlled, whereby the diisocyanate of high quality can be manufactured at excellent yield, with the causation of less environmental problems.
    Type: Application
    Filed: June 5, 2019
    Publication date: July 29, 2021
    Inventors: Dal Seong KIM, Oh Joon KWON, Sung Gi LEE, Gyeong Ha CHOI, Junghwan SHIN