Patents by Inventor Jean-Guy St-Hilaire

Jean-Guy St-Hilaire 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).

  • Beneficiation of kish graphite
    Patent number: 5672327
    Abstract: A method and apparatus system are disclosed for the beneficiation of kish to produce coarse high purity graphite wherein a concentrate containing at least about 90% carbon is formed, treated with a dilute acid solution, and the pulp then subjected to an adjuvant-assisted attrition to form a novel synthetic flake graphite of 99+ wt. % carbon with at least 70% of the mass retained on +100 mesh, and an overall recovery of graphitic carbon from the feed of greater than 85% by weight.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: September 30, 1997
    Assignee: Indresco Canada, Inc.
    Inventors: George W. Bennett, Maxime Leduc, Jean-Guy St-Hilaire, Christian Garceau
  • Apparatus system for beneficiation of kish graphite
    Patent number: 5560892
    Abstract: A apparatus system is disclosed for time beneficiation of kish to produce coarse high purity graphite wherein a concentrate containing at least about 90% carbon is formed, treated with a dilute acid solution, and the pulp then subjected to an adjuvant-assisted attrition to form a novel synthetic flake graphite of 99+ wt. % carbon with at least 70% of the mass retained on +100 mesh, and an overall recovery of graphitic carbon from the feed of greater than 85% by weight.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: October 1, 1996
    Assignee: Indresco Inc.
    Inventors: George W. Bennett, Maxime Leduc, Jean-Guy St-Hilaire, Christian Garceau
  • Beneficiation of flake graphite
    Patent number: 5518189
    Abstract: This invention concerns a method of beneficiating graphite to a higher purity level by dislodging the impurities from graphite by attrition preferably in an attrition cell which has at least one set of opposing pitched impellers. A pulp is formed preferably essentially consisting of a flake graphite:attrition adjuvant:water in a ratio of 1:2:0.8 to 10 and this pulp subjected to attrition in an attrition cell.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: May 21, 1996
    Assignee: Harbison-Walker Refractories Company
    Inventors: Tony Grondin, Jean-Guy St-Hilaire