Patents by Inventor Bangij Cao

Bangij Cao 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 removing wax from cellulosic fiber used in a fiber suspension for a paper-making machine
    Patent number: 6228212
    Abstract: The invention comprises, in one form thereof, a method of removing wax from recycled cellulosic fiber. The cellulosic fiber is pulped in a pulper to a suspension with a consistency of less than about 10% by weight. The suspension is then screened to remove coarse and fine contaminants. The screened suspension is diluted to a consistency of less than about 3% by weight. The wax is removed from the diluted suspension using a froth flotation device. The suspension is then washed and/or thickened.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: May 8, 2001
    Assignee: Voith Sultzer Paper Technology North America, Inc.
    Inventors: Oliver U. Heise, Bangij Cao