Patents by Inventor Mark N. Riddell

Mark N. Riddell 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).

  • Safety barrier
    Patent number: D574510
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: August 5, 2008
    Assignee: Hill & Smith Holdings PLC
    Inventors: Mark N. Riddell, Leslie J. Wall, Peter J. Wilkinson, John L. Addy, Mark G. Reynolds
  • Safety barrier
    Patent number: D574511
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: August 5, 2008
    Assignee: Hill & Smith Holdings PLC
    Inventors: Mark N. Riddell, Leslie J. Wall, Peter J. Wilkinson, John L. Addy, Mark G. Reynolds