Patents by Inventor Peter T. Sarjeant

Peter T. Sarjeant 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).

  • Reduction of lignin color
    Patent number: 4454066
    Abstract: Sulfonated lignin and lignosulfonate color reductions of over 90 percent, and in some cases as high as 95 percent, are achieved by a two-step process involving the blocking of phenolic groups on the lignin molecule with known blocking agents followed by oxidation with chlorine dioxide. The light colored lignin dispersants produced by the invention process exhibit very low staining and low azo dye reduction, good heat stability, dye grinding efficiency, and dispersion stability.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: June 12, 1984
    Assignee: Westvaco Corporation
    Inventors: Peter Dilling, Peter T. Sarjeant
  • Neutralization of phosphoric acid activated carbon
    Patent number: 4148753
    Abstract: Cellulosic carbon that has been activated by a phosphoric acid process, is acid neutralized by contacting the carbon with an aqueous suspension of an additive material comprising a metal oxide or hydroxide of aluminum, zinc, or one of the alkaline earth elements to bind residual acid on the carbon in the form of a substantially insoluble phosphate salt.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: April 10, 1979
    Assignee: Westvaco Corporation
    Inventor: Peter T. Sarjeant