Patents Assigned to Poly Pro, Inc.
  • Homogeneously fusion bonded cartridges
    Patent number: 4811861
    Abstract: A dispensing cartridge comprising a plurality of stacked individual articles formed of rigid or semi-rigid thermoplastic material, each article being fusion bonded at its periphery to adjacent articles in the stacked relationship. The cartridges are formed by passing a stack of the articles through a heating zone to fusion bond the articles one to the other without producing any visual discontinuity about the periphery of the cartridge.
    Type: Grant
    Filed: April 29, 1987
    Date of Patent: March 14, 1989
    Assignee: Poly Pro, Inc.
    Inventor: John T. Roberts