Patents by Inventor Chang-Young Oh

Chang-Young Oh 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 of 3-amino-1-hydroxypropane-1, 1-diphosphonic acid
    Patent number: 5792885
    Abstract: A preparation of 3-amino-1-hydroxypropane-1,1-diphosphonic acid includes the steps of: mixing N-alkoxycarbonyl-.beta.-alanine, phosphorous chloride and phosphorous acid in the ratio of 1:1:1.about.1:3:3 in a reaction solvent, xylene at 70.degree.-140.degree. C.; hydrolyzing; and obtaining 3-amino-1-hydroxypropane-1,1-diphosphonic acid as a product, thus decreasing the production of unidentified by-products and giving and low production cost by using xylene instead of chlorobenzene as a reaction solvent.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: August 11, 1998
    Assignee: Dong Kook Pharmaceutical Co., Ltd.
    Inventors: Won Hun Ham, Young Hun Jung, Chang Young Oh, Kee Young Lee, Yong Hyun Kim