Patents by Inventor Yang Rai Cho

Yang Rai Cho 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).

  • Preparation method for (Z)-7-chloro-((S)-2,2-dimethylcyclopropanecarboxamido)-2-heptenoic acid
    Patent number: 7371897
    Abstract: Provided is a novel preparation method of (Z)-7-chloro-((S)-2,2-dimethylcyclopropanecarboxamido)-2-heptenoic acid represented by the following formula (1), a key intermediate of cilastatin used as a supplement to imipenem. The novel preparation method of the invention produces a pure (Z)-7-chloro-((S)-2,2-dimethylcyclopropanecarboxamido)-2-heptenoic acid, a key intermediate of cilastatin, by selective hydrolysis of E isomers.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: May 13, 2008
    Assignee: Wischem Co., Ltd.
    Inventors: Yang Rai Cho, Young Ji Shim, Eon Cheol Koo, Seon Yi Jeong, Byung Hwan Kim