Patents by Inventor Victoria A. Prevysh

Victoria A. Prevysh 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).

  • Method of reducing the viscosity of a black liquor using thiocyanate salt
    Patent number: 5900112
    Abstract: A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquor in an amount sufficient to reduce the viscosity thereof. Preferred salts are thiocyanate salts. The black liquor is then oxidized to produce a green liquor and a causticizer added to the green liquor to produce a white liquor containing the sodium-based salts to be recycled. The white liquor is then returned to the digester.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: May 4, 1999
    Assignee: North Carolina State University
    Inventors: Richard J. Spontak, Joanna E. Roberts, Victoria A. Prevysh, Saad A Khan
  • Method of reducing the viscosity of a black liquor
    Patent number: 5635027
    Abstract: A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquor in an amount sufficient to reduce the viscosity thereof. Preferred salts are thiocyanate salts. The black liquor is then oxidized to produce a green liquor and a causticizer added to the green liquor to produce a white liquor containing the sodium-based salts to be recycled. The white liquor is then returned to the digester.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: June 3, 1997
    Assignee: North Carolina State University
    Inventors: Richard J. Spontak, Joanna E. Roberts, Victoria A. Prevysh, Saad A. Khan