Patents by Inventor Maria B. Ezhova

Maria B. Ezhova 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).

  • Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds
    Patent number: 7285181
    Abstract: A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P—CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: October 23, 2007
    Assignees: FPInnovations, University of British Columbia
    Inventors: Thomas Qiuxiong Hu, Brian R. James, Dominggus Yawalata, Maria B. Ezhova
  • Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds
    Publication number: 20040173328
    Abstract: A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P—CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.
    Type: Application
    Filed: February 4, 2004
    Publication date: September 9, 2004
    Inventors: Thomas Qiuxiong Hu, Brian R. James, Dominggus Yawalata, Maria B. Ezhova