Patents by Inventor Yeon-Soo Lee

Yeon-Soo Lee 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 method of arbutin intermediates
    Patent number: 6388103
    Abstract: The invention is related to a preparation method of arbutin intermediate (chemical formula I). It is characterized by the glycosylation of hydroquinone or mono-protectected hydroquinone (chemical formula II) with pentaacetyl-&bgr;-D-glucose (chemical formula III) in the presence of Lewis acid and base as catalysts. where Ac is acetyl group, R is hydrogen, alkyl or cycloalkyl group with 1 to 10 carbon, or aliphatic or aromatic acyl group with 1 to 10 carbon.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: May 14, 2002
    Assignees: Korea Research Institute of Chemical Technology, Biolano Co., Ltd.
    Inventors: Yeon Soo Lee, Bum Tae Kim, Yong Ki Min, No Kyun Park, Ki Ho Kim, Jae Seob Lee, See Wha Jeoung, Ki Soo Kim
  • Preparation method of arbutin intermediates
    Publication number: 20010053846
    Abstract: The invention is related to a preparation method of arbutin intermediate (chemical formula I). It is characterized by the glycosylation of hydroquinone or mono-protectected hydroquinone (chemical formula II) with pentaacetyl-&bgr;-D-glucose (chemical formula III) in the presence of Lewis acid and base as catalysts.
    Type: Application
    Filed: April 20, 2001
    Publication date: December 20, 2001
    Applicant: Bioland Co., Ltd.
    Inventors: Yeon Soo Lee, Bum Tae Kim, Yong Ki Min, No Kyum Park, Ki Ho Kim, Jae Seob Lee, See Wha Jeoung, Ki Soo Kim
  • Thiophenesulfonylurea derivatives and herbicidal composition containing the same
    Patent number: 5726127
    Abstract: The present invention relates to a thiophenesulfonylurea derivative represented by general formula (I), the process for preparation thereof, and herbicide using it; and a salt thereof, in which T represents a group T1, T2, or T3 having general formulae (a), wherein E represents a direct bond; R represents hydrogen or C.sub.1-4 acyl; R.sup.1 represents C.sub.1-6 alkyl substituted with 1 to 3 halogen atoms; R.sup.2 represents hydrogen, C.sub.1-3 alkyl, C.sub.1-3 haloalkyl, halogen, cyano, C.sub.1-3 alkoxy, C.sub.1-3 haloalkoxy, amino, methylamino, dimethylamino, or C.sub.1-3 alkyl substituted with C.sub.1-2 alkoxy, C.sub.1-2 haloalkoxy, thiol, methylthio, cyano or hydroxy; A represents a group selected from A1 to A4 having general formulae (b), and a herbicidal composition containing these derivatives.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 10, 1998
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Dae Whang Kim, Kyeong Yeol Yun, Jae Wook Ryu, Yeon Soo Lee, Seung Kyu Kang, In Taek Hwang