Patents by Inventor Geoffrey E. Seger

Geoffrey E. Seger 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).

  • High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process
    Patent number: 5268075
    Abstract: A high-efficiency wood pulp bleaching process to produce wood pulps with higher brightness at equal chlorine dioxide usage or of equal brightness at significantly reduced chlorine dioxide usage. The process comprises reacting the chlorine dioxide with wood pulp at a pH of about 5-10 for about 5-40 minutes and then acidifying the mixture to a pH of about 1.9-4.2. The mixture is then allowed to react for about 2 or more hours to complete the two-step high/low pH bleaching process.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: December 7, 1993
    Assignee: North Carolina State University
    Inventors: Hou-min Chang, Hasan Jameel, Geoffrey E. Seger