Patents by Inventor Ya-Chieh Chao

Ya-Chieh Chao 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 N-[1-(S)-ethyoxycarbonyl-3-phenylpropyl]-L-ananine N-carboxyanhydride
    Patent number: 6313338
    Abstract: A process for preparing N-[1-(S)-ethoxycarbonyl-3-phenylpropyl]-L-alanine N-carboxyanhydride of the following formula (I), is to react N-[1-(S)-ethyoxy carbonyl-3-phenylpropyl]-L-alanine with XCOOR, wherein X is halogen atom, R is C1-C6 alkyl, to obtain a N-alkoxycarbonyl compound, then reacting with an acyl group activation reagent, finally contact with water. The compound of formula (I) is a key intermediate of ACE inhibitors.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: November 6, 2001
    Assignee: Everlight USA, Inc.
    Inventors: Chong-Ming Chen, Yu-Liang Liu, Ya-Chieh Chao, Chien-Huang Wu
  • Process for preparing N-[1-(S)-ethyoxycarbonyl-3-phenylpropyl]-L-ananine N-carboxyanhydride
    Patent number: 6262274
    Abstract: A process for preparing N-[1-(S)-ethoxycarbonyl-3-phenylpropyl]-L-alanine N-carboxyanhydride of the following formula (I), is to react N-[1 -(S)-ethyoxy carbonyl-3-phenylpropyl]-L-alanine with XCOOR, wherein X is halogen atom, R is C1-C6 alkyl, to obtain a N-alkoxycarbonyl compound, then reacting with an acyl group activation reagent, finally contact with water. The compound of formula (I) is a key intermediate of ACE inhibitors.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: July 17, 2001
    Assignee: Everlight USA, Inc.
    Inventors: Chong-Ming Chen, Yu-Liang Liu, Ya-Chieh Chao, Chien-Huang Wu