Patents by Inventor Ian Alexander McLean

Ian Alexander McLean 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).

  • Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained
    Patent number: 6524437
    Abstract: A process for peroxide bleaching of pulp using magnesium oxide or magnesium hydroxide as a substitute for caustic soda wherein the pulp is bleached in the presence of hydrogen peroxide characterized in that the concentration of ion present in the magnesium oxide or magnesium hydroxide and the pulp is maintained less than 20 ppm and/or the concentration of manganese is maintained less than 10 ppm.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: February 25, 2003
    Assignee: Orica Australia Pty. Ltd.
    Inventors: Adam Hayden Vincent, Ian Alexander McLean
  • Process for peroxide bleaching of pulp using MgO particles
    Patent number: 6056853
    Abstract: A process for peroxide bleaching of pulp using magnesium oxide as sole alkaline source wherein said pulp is bleached in the presence of hydrogen peroxide for a maximum period of 180 minutes and achievement of a maximum target ISO brightness of 65 in regard to freshly prepared pulp characterized in that said magnesium oxide is utilized as MgO particles having a particle size of 5-500 microns and a particle surface area (PSA) of between 20-60 m.sup.2 /g. By using such parameters, a peroxide bleaching process may be carried out most efficiently on a commercial scale.
    Type: Grant
    Filed: February 19, 1998
    Date of Patent: May 2, 2000
    Assignee: Orica Australia Pty. Ltd.
    Inventors: Adam Hayden Vincent, Ian Alexander McLean