Patents by Inventor Kyum-Woo Choi

Kyum-Woo Choi 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).

  • Fine powder of waste polyurethane foam and method of manufacturing the same
    Patent number: 7559492
    Abstract: Disclosed are fine powder of waste polyurethane foam and a manufacturing method thereof. According to this invention, fine powder of waste polyurethane foam can be manufactured using a crushing process including primary and secondary coarse crushing steps and a fine grinding step and a classification process, thereby solving conventional problems of the deterioration of the properties and the difficulty forming a desired cell structure, due to the use of waste polyurethane powder having a large particle diameter, and widening the range of waste polyurethane that can be recycled.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: July 14, 2009
    Assignee: Industry-Academic Cooperation Foundation Gyeongsang National University
    Inventors: Jin-Kuk Kim, Kyum-Woo Choi
  • Fine powder of waste polyurethane foam and method of manufacturing the same
    Publication number: 20080116304
    Abstract: Disclosed are fine powder of waste polyurethane foam and a manufacturing method thereof. According to this invention, fine powder of waste polyurethane foam can be manufactured using a crushing process including primary and secondary coarse crushing steps and a fine grinding step and a classification process, thereby solving conventional problems of the deterioration of the properties and the difficulty forming a desired cell structure, due to the use of waste polyurethane powder having a large particle diameter, and widening the range of waste polyurethane that can be recycled.
    Type: Application
    Filed: November 16, 2006
    Publication date: May 22, 2008
    Applicants: Industry-Academic Cooperation Foundation Gyeongsang National University, JS Tech Co., Ltd.
    Inventors: Jin-Kuk Kim, Kyum-Woo Choi