Patents by Inventor Wei M. Cheng

Wei M. Cheng 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).

  • Clay thickener for use in water-based systems and joint compounds containing such compositions
    Patent number: 5112400
    Abstract: The present invention relates to a thickener composition comprising clay deposits and modified cellulose. It has now been discovered that a combination of a clay deposit and a modified cellulosic material provides thickening in water-based systems and particularly, in joint compound formulations. The composition shows a surprising thickening effect when added to water-based systems which would not be expected from the performance of these compounds individually as thickeners.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: May 12, 1992
    Assignee: Rheox, Inc.
    Inventors: Hemi N. Nae, Wei M. Cheng, Michael A. DeSesa