Patents by Inventor Tac-hoe Koo

Tac-hoe Koo 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).

  • Electrophotographic toner and method of preparing the same
    Patent number: 8227161
    Abstract: An electrophotographic toner includes a latex, a coloring agent, a wax and 3 to 1,000 ppm of each of Si and Fe, wherein a mole ratio of Si to Fe is from 0.1 to 5.
    Type: Grant
    Filed: May 13, 2008
    Date of Patent: July 24, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yoda Shin, Kyung-yol Yon, Tac-hoe Koo
  • ELECTROPHOTOGRAPHIC TONER AND METHOD OF PREPARING THE SAME
    Publication number: 20090111038
    Abstract: An electrophotographic toner includes a latex, a coloring agent, a wax and 3 to 1,000 ppm of each of Si and Fe, wherein a mole ratio of Si to Fe is from 0.1 to 5.
    Type: Application
    Filed: May 13, 2008
    Publication date: April 30, 2009
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Yoda SHIN, Kyung-yol Yon, Tac-hoe Koo