Patents by Inventor Peter R. Hughes

Peter R. Hughes 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).

  • Cutting element
    Patent number: 8910730
    Abstract: A cutting element includes a multilayer polycrystalline diamond element bonded to a substrate of a less hard material. The polycrystalline diamond element defines a matrix of interstitial volumes. The interstitial volumes of a first region of the diamond layer are adjacent a working surface thereof being substantially free of a catalyzing material. The interstitial volumes of a second region of the diamond layer are remote from the working surface containing the catalyzing material.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: December 16, 2014
    Assignee: National Oilwell Varco, L.P.
    Inventors: Nigel D. Griffin, Peter R. Hughes
  • Cutting Element
    Publication number: 20100200305
    Abstract: A cutting element comprises a multilayer polycrystalline diamond element 42 bonded to a substrate 44 of a less hard material, the polycrystalline diamond element 42 defining a matrix of interstitial volumes, the interstitial volumes of a first region of the diamond layer 42 adjacent a working surface 46 thereof being substantially free of a catalysing material, the interstitial volumes of a second region of the diamond layer 42 remote from the working surface 46 containing catalysing material.
    Type: Application
    Filed: February 11, 2010
    Publication date: August 12, 2010
    Inventors: Nigel D. Griffin, Peter R. Hughes