Patents by Inventor Seong Dal Heo

Seong Dal Heo 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).

  • Calcium carbonate having a surface charge, the preparing process thereof and filler for producing a paper using the same
    Patent number: 8859663
    Abstract: The present invention relates to a calcium carbonate having a surface charge, the preparing process thereof and filler for producing a paper using the same. The present invention provides the process of preparing a calcium carbonate having a surface charge, characterized in that it comprises the following steps of: preparing a solution mixture of one or more monomer selected from the group consisting of calcium hydroxide, acrylic acid, acrylamide, or [2-(acryloyloxy)ethyl]-trimethylammonium chloride; removing dissolved gases such as oxygen and carbon dioxide in the said solution by injecting nitrogen (N2) gas; adjusting pH of the said solution; and inducing a reaction by adding polymerization initiator of a high molecule while injecting carbon dioxide to the said mixture.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: October 14, 2014
    Assignee: Hankuk Paper Mfg. Co., Ltd.
    Inventors: Dong Ho Yoon, Seong Dal Heo, Seung Suk Seo, In Woo Cheong