Patents by Inventor Ji-Yeon Chang

Ji-Yeon 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).

  • Method of preparing sitagliptin and intermediates used therein
    Patent number: 8624026
    Abstract: Disclosed are a novel, simple and low-cost method for preparing sitagliptin of formula (I), as DPP-IV (dipeptidyl peptidase IV) inhibitor, which is useful in treating type 2 diabetes mellitus and key intermediates used in said preparation of sitagliptin:
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: January 7, 2014
    Assignee: Hanmi Science Co., Ltd
    Inventors: Nam Du Kim, Ji Yeon Chang, Dong Jun Kim, Hyun Seung Lee, Jae Hyuk Jung, Young Kil Chang, Gwan Sun Lee
  • METHOD OF PREPARING SITAGLIPTIN AND INTERMEDIATES USED THEREIN
    Publication number: 20120214997
    Abstract: Disclosed are a novel, simple and low-cost method for preparing sitagliptin, as DPP-IV (dipeptidyl peptidase IV) inhibitor, which is useful in treating type 2 diabetes mellitus and key intermediates used in said preparation of sitagliptin.
    Type: Application
    Filed: October 19, 2010
    Publication date: August 23, 2012
    Applicant: HANMI HOLDINGS CO., LTD.
    Inventors: Nam Du Kim, Ji Yeon Chang, Dong Jun Kim, Hyun Seung Lee, Jae Hyuk Jung, Young Kil Chang, Gwan Sun Lee
  • Method of preparing (6R)-3-hexyl-4-hydroxy-6-undecyl-5, 6-dihydropyran-2-one, and intermediate used in the method
    Patent number: 8242288
    Abstract: Provided is a method of preparing a (6R)-3-hexyl-4-hydroxy-6-undecyl-5,6-dihydropyran-2-one, and a (5R)-2-hexyl-5-hydroxy-3-iminohexadecanoate derivative used in said method as an intermediate.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: August 14, 2012
    Assignee: Hanmi Holdings Co., Ltd.
    Inventors: Sang Min Yun, Young Ho Moon, Young-Kil Chang, Dong Jin Hong, Ji-Yeon Chang, Moon Sub Lee, Jaeho Yoo, Ji Sook Kim, Cheol Kyung Kim
  • METHOD OF PREPARING (6R)-3-HEXYL-4-HYDROXY-6-UNDECYL-5, 6-DIHYDROPYRAN-2-ONE, AND INTERMEDIATE USED IN THE METHOD
    Publication number: 20100274029
    Abstract: Provided is a method of preparing a (6R)-3-hexyl-4-hydroxy-6-undecyl-5,6-dihydropyran-2-one, and a (5R)-2-hexyl-5-hydroxy-3-iminohexadecanoate derivative used in said method as an intermediate.
    Type: Application
    Filed: October 29, 2008
    Publication date: October 28, 2010
    Applicant: HANMI PHARM. CO., LTD.
    Inventors: Sang Min Yun, Young Ho Moon, Young-Kil Chang, Dong Jin Hong, Ji-Yeon Chang, Moon Sub Lee, Jaeho Yoo, Ji Sook Kim, Cheol Kyung Kim