Patents by Inventor Stephen W. Cowan

Stephen W. Cowan 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).

  • Distillation separation process of titanium tetrachloride and halohydrocarbon
    Patent number: 5242549
    Abstract: An improved process for separation of valuable components of a waste stream resulting from production of an olefin polymerization procatalyst by the addition to the waste stream of a separation solvent of intermediate boiling point, subjecting the resulting mixture to a first distillation zone to separate the desired waste stream components from the upper portion of the zone and passing the bottoms product to a second distillation zone wherein separation solvent is recovered from the upper portion of the zone for recycle and passing the bottoms product to disposal or further processing.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: September 7, 1993
    Assignee: Shell Oil Company
    Inventors: Michael W. Potter, Stephen W. Cowan, Robert S. Tomaskovic