Patents by Inventor A. Marshall Stoneham

A. Marshall Stoneham 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).

  • Method for synthesising diamond
    Patent number: 9346681
    Abstract: A method of synthesizing diamond, the method comprising; (i) providing, in the presence of an atomic hydrogen plasma and/or in the presence of atomic hydrogen radicals, in a dissolution zone a liquid metal saturated with carbon with respect to graphite precipitation; (ii) transferring at least a portion of the liquid metal from the dissolution zone to a deposition zone, (vi) exposing the liquid metal in the deposition zone to atomic hydrogen plasma and/or to atomic hydrogen radicals, the temperature of the liquid metal in the deposition zone being lower than the temperature of the liquid metal in the dissolution zone such that the liquid metal in the deposition zone is saturated, preferably supersaturated, with carbon with respect to diamond precipitation; (vii) precipitating carbon from the liquid metal in the deposition zone to synthesize diamond; and (viii) optionally removing the synthesized diamond from the metal.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: May 24, 2016
    Assignee: DESIGNED MATERIALS LIMITED
    Inventors: A. Marshall Stoneham, Doreen Stoneham, Philip H. Taylor
  • Method and apparatus for treating diamond using liquid metal saturated with carbon
    Patent number: 8679443
    Abstract: A method of treating a diamond, the method comprising: (i) providing a liquid metal saturated with carbon with respect to graphite precipitation; (ii) lowering the temperature of the liquid metal such that the liquid metal is saturated with carbon with respect to diamond precipitation; (iii) immersing a diamond in the liquid metal; and (iv) removing the diamond from the metal.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: March 25, 2014
    Assignee: Designed Materials Ltd
    Inventors: Philip H. Taylor, A. Marshall Stoneham
  • METHOD AND APPARATUS FOR TREATING DIAMOND USING LIQUID METAL SATURATED WITH CARBON
    Publication number: 20120107212
    Abstract: A method of treating a diamond, the method comprising: (i) providing a liquid metal saturated with carbon with respect to graphite precipitation; (ii) lowering the temperature of the liquid metal such that the liquid metal is saturated with carbon with respect to diamond precipitation; (iii) immersing a diamond in the liquid metal; and (iv) removing the diamond from the metal.
    Type: Application
    Filed: July 19, 2010
    Publication date: May 3, 2012
    Applicant: DESIGNED MATERIALS LIMITED
    Inventors: Philip H. Taylor, A. Marshall Stoneham