Patents by Inventor Je Hwan Chang

Je Hwan 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).

  • Gordona sp. CYKS1 (KCTC 0431BP) capable of desulfurizing fossil fuel containing organic sulfur compounds
    Patent number: 6204046
    Abstract: The present invention relates to Gordona sp. CYKS1 (KCTC 0431BP) capable of selective removal of organically bound sulfurs from carbonaceous fossil fuel such as petroleum and coal by cleaving bonds between carbon and sulfur atoms in the said sulfur-containing organic compounds, and a method for biological desulfurization using this strain at the room temperature and atmospheric pressure. Since Gordona sp. CYKS1 (KCTC 0431BP) utilizes various organic sulfur compounds in fossil fuel besides dibenzothiophene as a sole sulfur source, the method for biological desulfurization employing the Gordona strain has advantages over the conventional chemical methods as followings: The desulfurization can be carried out at a mild condition; the cost for installation and operation of equipments can be reduced; and, the desulfurization of highly complex organic sulfur compounds can be realized.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: March 20, 2001
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Yong Keun Chang, Ho Nam Chang, Sung-Keun Rhee, Je Hwan Chang, Jung Hyun Sung
  • Norcardia sp. CKYS2 ((KCTC 0432BP) capable of desulfurizing fossil fuel containing organic sulfur compounds
    Patent number: 6197570
    Abstract: The present invention relates to Nocardia sp. CYKS2 (KCTC 0432 Br) capable of selective removal of organically bound sulfurs from carbonaceous fossil fuel such as petroleum and coal by cleaving bonds between carbon and sulfur atoms in the said sulfur-containing organic compounds, and a method for biological desulfurization using this strain at the room temperature and atmospheric pressure. Since Nocardia sp. CYKS2 (KCTC 0432 Bp) utilizes various organic sulfur compounds in fossil fuel besides dibenzothiophene as a sole sulfur source, the method for biological desulfurization employing the Nocardia strain has advantages over the conventional chemical methods as followings: The desulfurization can be carried out at a mild condition; the cost for installation and operation of equipments can be reduced; and, the desulfurization of highly complex organic sulfur compounds can be realized.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: March 6, 2001
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Yong Keun Chang, Ho Nam Chang, Sung-Keun Rhee, Je Hwan Chang, Jung Hyun Sung