Patents by Inventor Frank R. Keith

Frank R. Keith 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 and apparatus for extruding mixtures of thermoplastic and thermoset materials and products made therefrom
    Patent number: 5523328
    Abstract: Disclosed as one embodiment is a method of producing useful articles from ground whole tire waste, which includes the steps of continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into a continuously cooled, open-ended casting chamber. The apparatus for practicing this embodiment includes an extruder, a transition nozzle having an outlet with a cross-section corresponding to the desired cross-section of the useful article, and a casting chamber being constructed and arranged to remove thermal energy from an inner surface of the casting chamber.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: June 4, 1996
    Assignee: Renewed Materials Industries, Inc.
    Inventors: James E. Rosenbaum, Frank R. Keith
  • Process for extruding mixtures of thermoplastic and thermoset materials
    Patent number: 5312573
    Abstract: Disclosed as one embodiment is a method of producing useful articles from ground whole tire waste, which includes the steps of continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into a continuously cooled, open-ended casting chamber.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: May 17, 1994
    Assignee: Renewed Materials Industries, Inc.
    Inventors: James E. Rosenbaum, Frank R. Keith