Patents by Inventor Daesang Lee

Daesang 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).

  • Strain for decomposing TMAH, and method of wastewater treatment using the same
    Patent number: 6770470
    Abstract: The present invention describes a wastewater treatment method by a microorganism decomposing Tetramethyl Ammonium Hydroxide (TMAH) which, utilized in etching the surface of silicone chip in semiconductor manufacturing process, is toxic and hard to decompose. The present invention provides novel microorganisms capable of decomposing TMAH. Also, the present invention provides a treatment method for wastewater containing TMAH, using the microorganisms. The present invention is useful in industrial field as an environmental friendly wastewater treatment method by decomposing over 90% of TMAH, one of environmental contamination materials in the wastewater of semiconductor factory.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: August 3, 2004
    Assignee: Inbionet Corporation
    Inventors: Daesang Lee, Mi-Kyoung Lee, Key-Jung Kang, Chul-Soo Shin, Jeong-Hwan Yun, Do-Young Yum, Jung-Ki Lee, Kee-Don Park, Ho-Joon Choi, Bon-Tag Koo
  • Novel strain for decomposing tmah, and method of wastewater treatment using the same
    Publication number: 20030008377
    Abstract: The present invention describes a wastewater treatment method by a microorganism decomposing Tetramethyl Ammonium Hydroxide (TMAH) which, utilized in etching the surface of silicone chip in semiconductor manufacturing process, is toxic and hard to decompose. The present invention provides novel microorganisms capable of decomposing TMAH. Also, the present invention provides a treatment method for wastewater containing TMAH, using the microorganisms. The present invention is useful in industrial field as an environmental friendly wastewater treatment method by decomposing over 90% of TMAH, one of environmental contamination materials in the wastewater of semiconductor factory.
    Type: Application
    Filed: March 5, 2002
    Publication date: January 9, 2003
    Inventors: Daesang Lee, Mi-Kyoung Lee, Key-Jung Kang, Chul-Soo Shin, Jeong-Hwan Yun, Do-Young Yum, Jung-ki Lee, Kee-Don Park, Ho-Joon Choi, Bon-tag Koo