Patents Represented by Attorney Walt Zielinski

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  • Kraft linerboard by densification and heat treatment
    Patent number: 4692212
    Abstract: Both the wet strength and the folding endurance of kraft linerboard are improved by subjecting the board to steps of densification and high temperature treatment during its production.
    Type: Grant
    Filed: August 23, 1985
    Date of Patent: September 8, 1987
    Assignee: International Paper Company
    Inventors: Roy S. Swenson, Donald M. MacDonald, Michael Ring, Jasper H. Field