Patents Represented by Attorney Warunee Srisiri
  • Patent number: 7491293
    Abstract: A multi-layered paperboard having a high brightness and exceptional uniformity. The white topped paperboard has a base layer(s) made from wood pulp and a top fibrous layer made of unbleached wood fiber, filler and a binder to create a top fibrous layer of sufficient uniformity at moderate brightness levels. The top fibrous layer optionally contains a coagulant and/or a retention aid. In a preferred embodiment, the top fibrous layer of the multi-layered paperboard product is coated with a coating of additional fillers and binders to produce the desired level of brightness and uniformity. The invention also includes a process for making a multi-layered paperboard.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: February 17, 2009
    Assignee: MeadWestvaco Corporation
    Inventors: Bruce W. Babcock, Tricia W. Thomas