Patents by Inventor William E. Walles

William E. Walles 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).

  • Sulfonation of polybenzoxazole and polybenzothiazole for improved adhesion to matrix resins
    Patent number: 5216114
    Abstract: A method for sulfonating items comprising polybenzazole polymers is described. These sulfonated polybenzazole items are incorporated into composites containing a matrix resin such as an epoxy resin. The interfacial shear strength of these sulfonated polybenzazole fiber-containing composites is significantly improved over the interfacial shear strength of similar composites containing unsulfonated polybenzazole fibers.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: June 1, 1993
    Assignee: The Dow Chemical Company
    Inventors: William E. Walles, Robert M. Nowak