Patents by Inventor Keith W. Knudsen

Keith W. Knudsen 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 manufacture of paperboard
    Patent number: 4913773
    Abstract: A method of producing a multi-ply paperboard comprising at least one ply high bulk fibers sandwiched between at least two plies of conventional papermaking fibers. In a preferred embodiment, high bulk fibers characterized by twists, kinks and curls are produced by mechanical deformation without substantial fibrillation or breakage of the fibers, as by dry hammermilling or wet milling of the fibers. An aqueous foam furnish is preferred for laying the ply containing high bulk fibers.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: April 3, 1990
    Assignee: James River-Norwalk, Inc.
    Inventors: Keith W. Knudsen, Thomas J. Ziolkowski, William C. Bean