Patents by Inventor Charles Gerard Sweeney

Charles Gerard Sweeney 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).

  • Bonding a diamond compact to a cemented carbide substrate
    Patent number: 6213380
    Abstract: A method of bonding a diamond compact comprising a polycrystalline mass of diamond and a bonding phase which contains free-silicon to a substrate is provided. The method includes the steps of contacting a surface of the compact with carbon or nitrogen or a mixture thereof under conditions suitable to cause free-silicon in the surface to react with the carbon and/or nitrogen and thereafter bonding that surface to the substrate, preferably by means of a braze. In a preferred form of the invention, the surface which is bonded to the substrate is acid cleaned after contact of that surface with carbon or nitrogen or a mixture thereof.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: April 10, 2001
    Inventors: John Lloyd Collins, Graeme David Dufferwiel, Christopher John Howard Wort, Charles Gerard Sweeney
  • Diamond treatment for passivating stress surface defects
    Patent number: 5916456
    Abstract: A surface of a diamond, particularly a diamond window, is treated by depositing a layer of a carbide-forming metal such as titanium, on the surface and thereafter removing the layer. The treatment has the effect of passivating stress surface defects in the diamond such as grain boundaries, twin defects and polishing damage.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: June 29, 1999
    Assignee: Diamanx Products Limited
    Inventors: Christopher John Howard Wort, Charles Gerard Sweeney, Andrew John Whitehead