Patents by Inventor Philip E. Bowden

Philip E. Bowden 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 salt scale precipitation by control of process stream pH and salt concentration
    Patent number: 5693184
    Abstract: A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of insoluble salts during the bleaching of pulp. The pulp is subjected to a bleaching sequence which includes a plurality of pulp treatment steps, wherein at least one pulp treatment step is conducted under alkaline conditions and at least one pulp treatment step is conducted under acidic conditions. A filtrate stream which contains dissolved insoluble salts therein is thus generated, and at least a portion of the filtrate stream is combined with an alkaline stream and pulp to cause the salts to associate with the pulp, thus removing the salts from the filtrate stream to reduce or eliminate the formation of salt scale upon process equipment during the bleaching of the pulp.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: December 2, 1997
    Assignee: Union Camp Patent Holding, Inc.
    Inventors: Thomas P. Gandek, James C. Joseph, Michael A. Pikulin, George Pangalos, Philip E. Bowden
  • Reduction of salt scale precipitation by control of process stream Ph and salt concentration
    Patent number: 5554259
    Abstract: A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of salts during the bleaching of pulp. The pulp is subjected to a bleaching sequence which includes a plurality of pulp treatment steps, wherein at least one pulp treatment step is conducted under alkaline conditions and at least one pulp treatment step is conducted under acidic conditions. A filtrate stream which contains dissolved salts therein is thus generated, and at least a portion of the filtrate stream is combined with an alkaline stream and pulp to cause the salts to associate with the pulp, thus removing the salts from the filtrate stream to reduce or eliminate the formation of salt scale upon process equipment during the bleaching of the pulp.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: September 10, 1996
    Assignee: Union Camp Patent Holdings, Inc.
    Inventors: Thomas P. Gandek, James C. Joseph, Michael A. Pikulin, George Pangalos, Philip E. Bowden