Patents by Inventor Anthony Parrish

Anthony Parrish 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).

  • Refiner bleaching with magnesium oxide and hydrogen peroxide
    Patent number: 6881299
    Abstract: Methods of bleaching mechanical pulp under alkaline conditions with hydrogen peroxide. The methods include introducing a source of magnesium ions and hydroxyl ions to a refiner. The wood particulates are refined into a pulp in the presence of the magnesium ions and hydroxyl ions, and optionally perhydroxyl ions to simultaneously refine and bleach the pulp in a refiner.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: April 19, 2005
    Assignee: North American Paper Corporation
    Inventors: Anthony Parrish, Roger O. Campbell, Raymond E. Harrison, Paul B. Mobley, Gregg McCarthy
  • Refiner bleaching with magnesium oxide and hydrogen peroxide
    Publication number: 20040112557
    Abstract: Methods of bleaching mechanical pulp under alkaline conditions with hydrogen peroxide. The methods include introducing a source of magnesium ions and hydroxyl ions to a refiner. The wood particulates are refined into a pulp in the presence of the magnesium ions and hydroxyl ions, and optionally perhydroxyl ions to simultaneously refine and bleach the pulp in a refiner.
    Type: Application
    Filed: December 9, 2003
    Publication date: June 17, 2004
    Applicant: Weyerhaeuser Company
    Inventors: Anthony Parrish, Roger O. Campbell, Raymond E. Harrison, Paul B. Mobley, Gregg McCarthy
  • High temperature peroxide bleaching of mechanical pulps
    Patent number: 6743332
    Abstract: A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A second step is to provide a bleaching liquor to the refining system of the pulp mill, wherein the liquor comprises an amount of hydrogen peroxide and an amount of alkali having greater than 0% to 100% magnesium hydroxide or soda ash or a combination thereof. A third step is to hold the pulp with the bleaching liquor at a temperature in the range of about 85° to about 160° C. and for about 2 to about 180 minutes. The components of the bleach liquor can be added at the first refiner or interstage between refiners.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: June 1, 2004
    Assignee: Weyerhaeuser Company
    Inventors: Kaaren K. Haynes, Roger O. Campbell, Zeecha L. Brooks, Anthony Parrish, Robert T. Hamilton
  • High temperature peroxide bleaching of mechanical pulps
    Publication number: 20020189021
    Abstract: A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A second step is to provide a bleaching liquor to the refining system of the pulp mill, wherein the liquor comprises an amount of hydrogen peroxide and an amount of alkali having greater than 0% to 100% magnesium hydroxide or soda ash or a combination thereof. A third step is to hold the pulp with the bleaching liquor at a temperature in the range of about 85° to about 160° C. and for about 2 to about 180 minutes.
    Type: Application
    Filed: May 16, 2001
    Publication date: December 19, 2002
    Applicant: Weyerhaeuser Company
    Inventors: Kaaren K. Haynes, Roger O. Campbell, Zeecha L. Brooks, Anthony Parrish, Robert T. Hamilton