Patents by Inventor Joseph D. Evans

Joseph D. Evans 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).

  • Diamond cutting tools
    Patent number: 5731079
    Abstract: Single hard particles or single point cutting tools having the particles bonded thereto are coated with a modulated or layered composition of transition metal compounds or with titanium compounds to decrease mechanical failure of the particles. Titanium and zirconium nitrides may be used to form the modulated composition. Total thickness of the coatings is in the range from about 0.5 micrometer to about 30 micrometers. Individual layers of varying composition have a thickness in the range from about 0.5 nanometers to about 30 nanometers.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: March 24, 1998
    Assignee: SI Diamond Technology, Inc.
    Inventors: Mark S. Hammond, Joseph D. Evans
  • Diamond cutting tools
    Patent number: 5681653
    Abstract: Single hard particles or single point cutting tools having the particles bonded thereto are coated with a modulated or layered composition of transition metal compounds or with titanium compounds to decrease mechanical failure of the particles. Titanium and zirconium nitrides may be used to form the modulated composition. Total thickness of the coatings is in the range from about 0.5 micrometer to about 30 micrometers. Individual layers of varying composition have a thickness in the range from about 0.5 nanometers to about 30 nanometers.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: October 28, 1997
    Assignee: SI Diamond Technology, Inc.
    Inventors: Mark S. Hammond, Joseph D. Evans
  • Coated grinding tool
    Patent number: 5588975
    Abstract: Grinding tools are provided having a composite working surface with a metal bonding material coated with a modulated composition of transition metal compounds. Titanium nitride and zirconium nitride are suitable compounds. A manufacturing method for such grinding tools is also provided, employing cathodic arc deposition with transition metal compounds being formed from arcs of transition metal cathodes and a reactive gas.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: December 31, 1996
    Assignee: SI Diamond Technology, Inc.
    Inventors: Mark S. Hammond, Joseph D. Evans
  • Corrosion free hard coated metal substrates
    Patent number: 4950365
    Abstract: A process for making an article comprising a substrate, a first coating on the surface of said substrate of a thin, hard coated metal compound, and a second coating on the surface of said first coat of a thin uniform conformal polymeric material.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: August 21, 1990
    Assignee: Vac-Tec Systems, Inc.
    Inventor: Joseph D. Evans