Patents by Inventor Thomas Richard Clark

Thomas Richard Clark 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 centrifugal separation of material
    Patent number: 6155429
    Abstract: This invention relates to a process for centrifugal separation of polyamide and polypropylene materials contained in a liquid slurry. The polypropylene material has a specific gravity which is less than the specific gravity of the liquid carrier and the polyamide material has a specific gravity which is greater than the specific gravity of the liquid carrier. A gas, preferably air, is injected into the slurry prior to feeding the slurry to a hydrocyclone.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: December 5, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Thomas Richard Clark