Patents by Inventor Wen-Hsin Chang

Wen-Hsin Chang 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 ANTIBIOTIC COMPOUNDS
    Publication number: 20120190842
    Abstract: The present invention relates to a process for the preparation of carbapenem antibiotic compounds, which is useful for intravenous and intramuscular administration.
    Type: Application
    Filed: January 24, 2011
    Publication date: July 26, 2012
    Applicant: SAVIOR LIFETEC CORPORATION
    Inventors: Wei-Hong Tseng, Wen-Hsin Chang, Shiuan-Ting Chuang
  • Preparation of Carbapenem Intermediate and Their Use
    Publication number: 20110288289
    Abstract: The present invention relates to preparing carbapenem intermediates that are useful to produce Ertapenem, Meropenem and Doripenem.
    Type: Application
    Filed: May 19, 2010
    Publication date: November 24, 2011
    Applicant: SAVIOR LIFETEC CORPORATION
    Inventors: Wei-Hong Tseng, Wen-Hsin Chang, Yuan-Liang Kuo, Chia-Mao Chang
  • PROCESS FOR THE PREPARATION OF CARBAPENEM USING CABAPENEM INTERMEDIATES AND RECOVERY OF CABAPENEM
    Publication number: 20110288290
    Abstract: The present invention relates to preparing carbapenem intermediates that are useful to produce Ertapenem, Meropenem and Doripenem; and provides an effective process for recovering ertapenem compounds.
    Type: Application
    Filed: May 4, 2011
    Publication date: November 24, 2011
    Applicant: SAVIOR LIFETEC CORPORATION
    Inventors: Wei-Hong Tseng, Wen-Hsin Chang, Chia-Mao Chang, Chia-Wei Yeh, Yuan-Liang Kuo
  • POLYMERIC POLYAMINES AND METHOD FOR PRODUCING THE SAME
    Publication number: 20110288239
    Abstract: The present invention discloses a polymeric polyamine which can be produced by polymerizing polyoxyalkylene-amine and a linker. The linker can be anhydride, carboxylic acid, epoxy, isocyanate or poly(styrene-co-maleic anhydride) copolymers (SMA). The present invention also discloses a method for stabilizing the Ag nanoparticles with polymeric polyamine. The polymeric polyamine serving as a stabilizer or dispersant is mixed with a water solution of silver salt and then a reducer is provided to reduce the silver ions and form an organic or a water solution of Ag nanoparticles. Water or solvent of this solution can be further removed through a heating, freezing or decompression process, and thus solid content of the solution can be increased. The concentrated solution also can be diluted to obtain a stable dispersion without aggregation.
    Type: Application
    Filed: August 1, 2011
    Publication date: November 24, 2011
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Jiang-Jen Lin, Wei-Cheng Tsai, Yen-Chi Hsu, Wen-Hsin Chang
  • Polymeric polyamines and method for stabilizing silver nanoparticle by employing the same
    Patent number: 8013048
    Abstract: The present invention discloses a polymeric polyamine which can be produced by polymerizing polyoxyalkylene-amine and a linker. The linker can be anhydride, carboxylic acid, epoxy, isocyanate or poly(styrene-co-maleic anhydride) copolymers (SMA). The present invention also discloses a method for stabilizing the Ag nanoparticles with polymeric polyamine. The polymeric polyamine serving as a stabilizer or dispersant is mixed with a water solution of silver salt and then a reducer is provided to reduce the silver ions and form an organic or a water solution of Ag nanoparticles. Water or solvent of this solution can be further removed through a heating, freezing or decompression process, and thus solid content of the solution can be increased. The concentrated solution also can be diluted to obtain a stable dispersion without aggregation.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: September 6, 2011
    Assignee: National Taiwan University
    Inventors: Jiang-Jen Lin, Wei-Cheng Tsai, Yen-Chi Hsu, Wen-Hsin Chang
  • POLYMERIC POLYAMINES AND METHOD FOR STABILIZING SILVER NANOPARTICLE BY EMPLOYING THE SAME
    Publication number: 20090149583
    Abstract: The present invention discloses a polymeric polyamine which can be produced by polymerizing polyoxyalkylene-amine and a linker. The linker can be anhydride, carboxylic acid, epoxy, isocyanate or poly(styrene-co-maleic anhydride) copolymers (SMA). The present invention also discloses a method for stabilizing the Ag nanoparticles with polymeric polyamine. The polymeric polyamine serving as a stabilizer or dispersant is mixed with a water solution of silver salt and then a reducer is provided to reduce the silver ions and form an organic or a water solution of Ag nanoparticles. Water or solvent of this solution can be further removed through a heating, freezing or decompression process, and thus solid content of the solution can be increased. The concentrated solution also can be diluted to obtain a stable dispersion without aggregation.
    Type: Application
    Filed: June 17, 2008
    Publication date: June 11, 2009
    Applicant: National Taiwan University
    Inventors: Jiang-Jen Lin, Wei-Cheng Tsai, Yen-Chi Hsu, Wen-Hsin Chang
  • Process for preparing 3,4-dihydroxy-benzonitrile
    Patent number: 6790977
    Abstract: A process for preparing 3,4-dihydroxybenzonitrile includes the steps of reacting a nitrile compound with an alkali metal halide, followed by treating with an acid.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: September 14, 2004
    Assignee: Sinon Corporation
    Inventors: Lung-Huang Kuo, Dei-She Ke, Chih-Da Lin, Shyh-Shyan Jwo, Wen-Hsin Chang
  • Process for preparing 3,4-dihydroxy-benzonitrile
    Publication number: 20040024239
    Abstract: A process for preparing 3,4-dihydroxybenzonitrile includes the steps of reacting a nitrile compound with an alkali metal halide, followed by treating with an acid.
    Type: Application
    Filed: July 30, 2002
    Publication date: February 5, 2004
    Inventors: Lung-Huang Kuo, Dei-She Ke, Chih-Da Lin, Shyh-Shyan Jwo, Wen-Hsin Chang