Patents by Inventor Janet E. Freeman

Janet E. Freeman 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 syntactic foam composites and method of forming same
    Patent number: 4595623
    Abstract: Fiber-reinforced syntactic foam composites having a low specific gravity and a low coefficient of thermal expansion suitable for forming lightweight structures for spacecraft applications are prepared from a mixture of a heat curable thermosetting resin, hollow microspheres having a diameter of about 5 to 200 micrometers and fibers having a length less than or equal to 250 micrometers.
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: June 17, 1986
    Assignee: Hughes Aircraft Company
    Inventors: Preston S. Du Pont, Janet E. Freeman, Robert E. Ritter, Alois Wittmann