Patents by Inventor Dwaine E. Siptak

Dwaine E. Siptak 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).

  • TiO.sub.2 slurry stabilization
    Patent number: 5989331
    Abstract: A stable aqueous pigment slurry and a process for preparing same. The slurry contains about 50 to 90 wt. %, based on the weight of the slurry, of a pigment such as titanium dioxide and about 0.2 to 3.0 wt. %, based on the weight of the slurry, of a smectite clay such as bentonite, hectorite or montmorillonite. Preferably, the pigment slurry also contains about 0.1 to 2.0 wt. %, based on the weight of the slurry, of a dispersant. The process involves admixing a pigment slurry and a smectite clay slurry and preferably also the dispersant by milling the three components together under high shear conditions.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: November 23, 1999
    Assignee: Southern Clay Products, Inc.
    Inventors: Carl J. Bauer, John D. Boothe, Frank S. Scimecca, Dwaine E. Siptak