Patents by Inventor John Urquhart Dewar

John Urquhart Dewar 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).

  • Sample tube for a percussive hammer
    Patent number: D412447
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: August 3, 1999
    Assignee: SDS Digger Tools Pty Ltd
    Inventors: John Urquhart Dewar, Malcolm Bicknell McInnes