Patents by Inventor Hanjian Xu

Hanjian Xu 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 a stratified paper
    Patent number: 6902650
    Abstract: The present invention provides a method making stratified paper by redistributing the pulp suspension inside the headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: June 7, 2005
    Assignee: International Paper Company
    Inventors: Chang Shin Park, Hanjian Xu
  • Method of making a stratified paper
    Publication number: 20040154775
    Abstract: The present invention provides a method making stratified paper by redistributing the pulp suspension inside the headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.
    Type: Application
    Filed: November 3, 2003
    Publication date: August 12, 2004
    Inventors: Chang Shin Park, Hanjian Xu