Patents by Inventor Stephen David Ridyard

Stephen David Ridyard 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).

  • Making paper
    Patent number: 6616803
    Abstract: This invention is directed to improvements in paper incorporating an elongate impermeable element, to a method of making such paper and to documents made therefrom.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: September 9, 2003
    Assignee: De la Rue International Limited
    Inventors: Roland Isherwood, Stephen David Ridyard