Patents by Inventor Thomas L. Ravins

Thomas L. Ravins 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).

  • Fiber reinforced plaster molds for metal casting
    Patent number: 4818287
    Abstract: An improved composition and process for preparing plaster molds used in casting nonferrous metals is provided wherein plaster molds are prepared from particulate calcium sulfate molding plaster admixed with insoluble calcium sulfate anhydrite whisker fibers.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: April 4, 1989
    Assignee: Georgia-Pacific Corporation
    Inventors: Thomas L. Ravins, Dale R. Greve