Patents by Inventor Se-Kyu Hwang

Se-Kyu Hwang 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).

  • Fabric softener and preparation method thereof
    Patent number: 8680039
    Abstract: The present invention relates to a method of preparing a fabric softener and to a fabric softener prepared thereby, and more particularly, to a method of preparing a fabric softener containing an esterquat by performing a two-step transesterification reaction on oil and tertiary hydroxyalkyl amine at a low temperature in a high vacuum state under specific conditions, and then quaternizing the resultant product. The method of preparing a fabric softener containing an esterquat according to the present invention can reduce the content of unconverted glyceride, glyceryl ester, or a mixture thereof, and can provide a fabric softener with excellent long-term stability.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: March 25, 2014
    Assignee: Sunjin Chemical Co., Ltd.
    Inventors: Sang-Ho Lee, Han-Song Chu, Jae-Young Choi, Se-Kyu Hwang