Patents by Inventor Si Sl Liew

Si Sl Liew 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).

  • Disperse dyes, their preparation and their use
    Patent number: 9567464
    Abstract: The present invention refers to dyes of the formula (I) and mixtures thereof a process for their production and to their use.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: February 14, 2017
    Assignee: DyStar Colours Distribution GmbH
    Inventors: Yongnian Gao, Si Sl Liew, Samuel Shantong Fu, Roxana Barbieru