Patents by Inventor Michael B. Ringley

Michael B. Ringley 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 delignification of lignocellulosic material in the presence of anthraquinone in solution with white and black liquors
    Patent number: 4574032
    Abstract: A method of introducing anthraquinone into the kraft pulping process for the delignification of lignocellulosic material by dissolving or homogeneously dispersing the anthraquinone in a mixture of from about 10% to about 50% white kraft pulping liquor and, correspondingly, from about 90% to about 50% black kraft pulping liquor and then blending this solution with the white liquor feed into the pulping digesters.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: March 4, 1986
    Assignee: Westvaco Corporation
    Inventor: Michael B. Ringley