Patents by Inventor Sandi G. Campbell

Sandi G. Campbell 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).

  • Organic modification of a layered silicate by co-ion exchange of an alkyl ammonium and a mono-protonated diamine
    Patent number: 6828367
    Abstract: Co-Ion exchange of the interlayer cations of a layered silicate with a mono-protonated aromatic diamine and an alkyl ammonium ion into the silicate galleries. The presence of the alkyl ammonium ion provides low oligomer melt viscosity during processing. The presence of the diamine allows chemical reaction between the silicate surface modification and the monomers. This reaction strengthens the polymer silicate interface, and ensures irreversible separation of the individual silicate layers. Improved polymer thermal oxidative stability and mechanical properties are obtained.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: December 7, 2004
    Assignee: The United States of America as represented by the United States National Aeronautics and Space Administration
    Inventor: Sandi G. Campbell