Patents by Inventor Ja Heouk Khoo

Ja Heouk Khoo 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).

  • PROCESS FOR THE PREPARATION OF 2-METHYL-2'-PHENYLPROPIONIC ACID DERIVATIVES AND NOVEL INTERMEDIATE COMPOUNDS
    Publication number: 20110009636
    Abstract: The present invention relates to a process for preparing 2-methyl-2?-phenylpropionic acid derivatives showing antihistamine activity in more simplified way, intermediate compounds and their preparation processes used therefor. According to the present invention, pharmaceutically useful 2-methyl-2?-phenylpropionic acid derivatives can be prepared with high yield and purity on industrial scale.
    Type: Application
    Filed: February 12, 2009
    Publication date: January 13, 2011
    Inventors: Chun-Ho Lee, Ja-Heouk Khoo, Kyoung-Chan Kwon, Hyun Ju
  • Processes for preparing quinolonecarboxylate derivatives
    Patent number: 7220861
    Abstract: Provided is a process for preparing quinolonecarboxylate derivatives under a mild condition in high yield, so as to be favorably applied to a large-scale mass production thereof.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: May 22, 2007
    Assignee: Yuhan Corporation
    Inventors: Tai Au Lee, Nam Jin Park, Ja Heouk Khoo, Seong Ho Song, Ju Young An
  • Processes for preparing &bgr;-D-ribofuranose derivatives
    Patent number: 6660854
    Abstract: Provided are a process for preparing &bgr;-D-ribofuranose derivatives, which are useful as an intermediate for the preparation of ribavirin. The process can be performed under a mild condition, in the presence of a catalyst selected from the group consisting of methanesulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: December 9, 2003
    Assignee: Yuhan Corporation
    Inventors: Tai-Au Lee, Nam-Jin Park, Ja-Heouk Khoo, Byung-Cheol Lee
  • Processes for preparing beta-D-ribofuranose derivatives
    Publication number: 20030120064
    Abstract: Provided are a process for preparing &bgr;-D-ribofuranose derivatives, which are useful as an intermediate for the preparation of ribavirin. The process can be performed under a mild condition, in the presence of a catalyst selected from the group consisting of methanesulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid.
    Type: Application
    Filed: December 6, 2002
    Publication date: June 26, 2003
    Inventors: Tai-Au Lee, Nam-Jin Park, Ja-Heouk Khoo, Byung-Cheol Lee