Patents by Inventor Robert V. Mahony

Robert V. Mahony 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).

  • Multi-ply paperboard with improved stiffness
    Patent number: 6068732
    Abstract: Stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions. Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft.) basis weight paperboard. The fractionation "accepts" are repositioned to the center ply for a 12% to 15% increase in Taber stiffness. The short, "accept" fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: May 30, 2000
    Assignee: International Paper Company
    Inventors: Robert F. Cassidy, Anant D. Mahale, Dennis J. Kerstanski, Robert V. Mahony
  • Method of making multi-ply paperboard sheet having layers of different fiber properties
    Patent number: 5916417
    Abstract: Stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions. Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft.) basis weight paperboard. The fractionation "accepts" are repositioned to the center ply for a 12% to 15% increase in Taber stiffness. The short, "accept" fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: June 29, 1999
    Assignee: International Paper Company
    Inventors: Robert F. Cassidy, Anant D. Mahale, Dennis J. Kerstanski, Robert V. Mahony