Patents by Inventor Won-Hun Ham

Won-Hun Ham 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 preparing prostaglandin derivatives and stereospecific starting material thereof
    Patent number: 6989458
    Abstract: The present invention relates to a process for effectively preparing prostaglanin derivatives and to a stereospecific alkyl halide containing 15S-alcohol group as a starting material.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: January 24, 2006
    Assignee: Yonsung Fine Chemical Co.
    Inventors: Won-Hun Ham, Chang-Young Oh, Yong-Hyun Kim, Yiu-Suk Lee, Kee-Young Lee
  • Process for preparing prostaglandin derivatives and stereospecific starting material thereof
    Publication number: 20050192451
    Abstract: The present invention relates to a process for effectively preparing prostaglanin derivatives and to a stereospecific alkyl halide containing 15S-alcohol group as a starting material.
    Type: Application
    Filed: December 22, 2004
    Publication date: September 1, 2005
    Inventors: Won-Hun Ham, Chang-Young Oh, Yong-Hyun Kim, Yiu-Suk Lee, Kee-Young Lee
  • Process for preparing sulfamoyl-substituted phenethylamine derivatives
    Patent number: 6914159
    Abstract: The present invention relates to a novel process for preparing sulfamoyl-substituted phenethylamine derivatives, specifically, 5-{2-[2-(2-alkoxy-phenoxy)ethylamino]-propyl}-2-methoxy-benzene sulfonamide of the formula (1).
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: July 5, 2005
    Assignee: Yonsung Fine Chemical Co., Ltd.
    Inventors: Won Hun Ham, Chang Young Oh, Kee Young Lee, Yong Hyun Kim, Yiu Suk Lee
  • Process for preparing prostalglandin derivatives and stereospecific starting material thereof
    Patent number: 6852880
    Abstract: The present invention relates to a process for effectively preparing prostaglandin derivatives and to a stereospecific alkyl halide containing 15S-alcohol group as a starting material.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: February 8, 2005
    Assignee: Yonsung Fine Chemical Co.
    Inventors: Won-Hun Ham, Chang-Young Oh, Kee-Young Lee, Yong-Hyun Kim, Yiu-Suk Lee
  • Process for preparing prostalglandin derivatives and stereospecific starting material thereof
    Publication number: 20040116693
    Abstract: The present invention relates to a process for effectively preparing prostaglandin derivatives and to a stereospecific alkyl halide containing 15S-alcohol group as a starting material.
    Type: Application
    Filed: October 24, 2003
    Publication date: June 17, 2004
    Inventors: Won-Hun Ham, Chang-Young Oh, Kee-Young Lee, Yong-Hyun Kim, Yiu-Suk Lee
  • Stereoselective synthesis of oxazoline derivative
    Patent number: 6143900
    Abstract: The present invention relates to stereoselective synthetic method of oxazoline derivative. More particularly, it relates to a synthetic method of oxazoline derivative having the structure of formula I. ##STR1## wherein R represents phenyl, benzyl, methyl, ethyl, isopropyl, isobutyl, cyclohexyl or cyclohexylmethyl.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: November 7, 2000
    Assignee: Dong Kook Pharmaceutical Co., Ltd.
    Inventors: Won Hun Ham, Kyung Seok Choi, Han Won Lee, Sung Ki Seo, Jin Kyu Park, Ki Young Lee, Yong Hyun Kim
  • Process for the preparation of oxazoline compound
    Patent number: 6127546
    Abstract: The present invention relates to a process for the preparation of an oxazoline compound which is easily chemically converted to a beta-amino-alpha-hydroxy acid or a gamma-amino-beta-hydroxy acid. The method comprises producing a compound of the following formula (4) using .alpha.-amino acid. The produced compound (4) is subjected to an intramolecular cyclization to produce an oxazoline compound of the following formula (3). The oxazoline compound (3) is oxidized at a vinyl group with RuCl.sub.3 or NaIO.sub.4 to produce an oxazoline compound of the following formula (1) which is easily chemically converted to a beta-amino-alpha-hydroxy acid. Alternatively, the oxazoline compound (3) may also be treated with 9-borabiclo[3.3.1]nonane such that a hydroxy group is introduced into the end of the vinyl group of the oxazoline compound(3). The introduced end hydroxy group is oxidized with RuCl.sub.3 or NaIO.sub.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: October 3, 2000
    Assignee: Dong Kook Pharmaceutical Co., Ltd.
    Inventors: Jin Kyu Park, Kyung Seok Choi, Han Won Lee, Sung Ki Seo, Won Hun Ham, Chang Young Oh, Kee Young Lee, Yong Hyun Kim, Min Sung Park
  • 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