Patents by Inventor Donald L. Duncan

Donald L. Duncan 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).

  • Asymmetrical reversible article of footwear
    Patent number: 6035554
    Abstract: An asymmetrical article of footwear reversible sole is provided which offers improved performance and fit. The article of footwear is worn on a different foot when reversed. The invention may be shaped to fit the general outline of a person's foot and may be configured to fit the contours of the bottom of the person's foot. Different materials may be used for the different parts of the composite sole thus allowing the reversible, asymmetrical, composite sole to be used in dual purpose situations.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: March 14, 2000
    Inventor: Donald L. Duncan