Patents by Inventor Dean R. Herfindahl

Dean R. Herfindahl 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).

  • Microwave resonant cavity applicator for heating articles of indefinite length
    Patent number: 5146058
    Abstract: A rectangular microwave resonant cavity applicator comprising two spaced-apart, cavity-containing sections is disclosed for heating a product web. Each section has a planar peripheral lip which faces the other and the sections are spaced apart by a distance "d". The lips have arrays of ferrite segments mounted on their surfaces which serve to limit radiation of microwave energy from the open space between the sections, through which the product web passes.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: September 8, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dean R. Herfindahl, Hua-Feng Huang, Richard W. Lewis, Walter A. Wallace