Patents by Inventor Ralph F. Ayres

Ralph F. Ayres 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).

  • Interfacial surface generator
    Patent number: 5094788
    Abstract: Method and apparatus are disclosed for making multilayer film having a prescribed gradient in, or distribution of, the thicknesses of one or more materials through the thickness of the film.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: March 10, 1992
    Assignee: The Dow Chemical Company
    Inventors: Walter J. Schrenk, Ranganath K. Shastri, Ralph F. Ayres, Daniel J. Gosen