Patents Assigned to IMPEX
  • Method of brightening kaolin clay by thermal oxidative decarboxylation of organic contaminants
    Patent number: 5397754
    Abstract: A method for brightening kaolin contaminated with organic matter by decarboxylation treatment of an aqueous kaolin slurry. The decarboxylation is carried out by contacting the clay slurry with selected oxidizing agent in a pressurized reaction vessel at a temperature of 175.degree.-500.degree. C. without dehydroxylation (calcination) of the kaolin. Oxidizing agents include oxygen, ozone, hydrogen peroxide, and hypochlorite.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: March 14, 1995
    Assignee: IMPEX
    Inventors: Joseph Iannicelli, John T. Williamson
  • Key ring
    Patent number: D394345
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: May 19, 1998
    Assignee: Impex
    Inventor: Patrick Marguerie
  • Crochet hook
    Patent number: D401759
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: December 1, 1998
    Assignee: Impex
    Inventor: Patrick Marguerie
  • Combined mirror and stand
    Patent number: D402949
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: December 22, 1998
    Assignee: Impex
    Inventor: Patrick Marguerie