Patents by Inventor Philip J. Rennolds

Philip J. Rennolds 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).

  • Process for zone refining with a helical solution zone
    Patent number: 4423248
    Abstract: A process for refining an impure material using a helical solution zone and employing a common solvent for both material to be purified and impurity.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: December 27, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Philip J. Rennolds
  • Corrugated interface zone refiner
    Patent number: 4255390
    Abstract: The present invention relates to a zone refiner and the process of operating same wherein the freezing interface between the molten zone and the solid zone is corrugated. The use of such a corrugated interface enables one to pass the interface more rapidly along the length of the refiner for a given refining efficiency.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: March 10, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Philip J. Rennolds
  • Corrugated interface zone refiner
    Patent number: 4196042
    Abstract: A zone refiner and the process of operating same wherein the freezing interface between the molten zone and the solid zone is corrugated. The use of such a corrugated interface enables one to pass the interface more rapidly along the lenth of the refiner for a given refining efficiency.
    Type: Grant
    Filed: April 14, 1978
    Date of Patent: April 1, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Philip J. Rennolds