Patents by Inventor David B. Jack

David B. Jack 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 making pulp having high hemicellulose content
    Publication number: 20040200589
    Abstract: Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.
    Type: Application
    Filed: April 8, 2003
    Publication date: October 14, 2004
    Inventors: William J. Herring, David B. Jack, Grant R. Bourree
  • Cellulose pulp having increased hemicellulose content
    Publication number: 20040200587
    Abstract: Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.
    Type: Application
    Filed: April 8, 2003
    Publication date: October 14, 2004
    Inventors: William J. Herring, David B. Jack, Grant R. Bourree
  • Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate
    Patent number: 6315863
    Abstract: Collection of a post-chlorination washer filtrate and recycle thereof to acidify a wood pulp stream entering the initial chlorine dioxide bleaching stage is provided in order to reduce the formation of barium scale.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: November 13, 2001
    Assignee: Weyerhaeuser Company
    Inventor: David B. Jack