Patents by Inventor RoseMarie E. Stewart

RoseMarie E. Stewart 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).

  • Gelling system for hydrocarbon fluids
    Patent number: 6248699
    Abstract: The present invention relates to a gelled hydrocarbon fluid useful as a fracturing fluid in subterranean formations comprising at least one gelling agent which is a salt of a carboxylic acid having from about 6 to about 30 carbon atoms. An activator which is a difunctional and/or trifunctional carboxylic acid is preferably added to control gel time.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: June 19, 2001
    Assignee: Crompton Corporation
    Inventors: Shankar Subramanian, Yun-peng Zhu, Charles R. Bunting, RoseMarie E. Stewart
  • Stable aqueous dispersions of dibutyltin oxide
    Patent number: 5807802
    Abstract: Disclosed are aqueous dispersions of dibutyltin oxide which contain water, dibutyltin oxide in substantial amounts on the order of 50 to 75 wt. %, as well as a fatty acid ethoxylate surfactant, a suspending agent, and a viscosity modifier component of one or more C.sub.12 -C.sub.24 fatty acids and/or alkali metal salts thereof.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: September 15, 1998
    Assignee: Witco Corporation
    Inventors: RoseMarie E. Stewart, Harold Mark, Oliver Schumacher, Ulrich Stewen