Patents by Inventor Ralph W. MacKenzie

Ralph W. MacKenzie 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 for assembling a closure tab to a lid
    Patent number: 7523534
    Abstract: A method and apparatus for assembling a first thermoformed workpiece, such as a tab closure, to a second thermoformed workpiece, such as a lid.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: April 28, 2009
    Assignee: Whirlpool Corporation
    Inventors: Ralph W. MacKenzie, Tyler J. DeLong, Ryan P. Gingras
  • Method for assembling a closure tab to a lid
    Patent number: 7353582
    Abstract: A method and apparatus for assembling a first thermoformed workpiece, such as a tab closure, to a second thermoformed workpiece, such as a lid.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: April 8, 2008
    Assignee: Dart Container Corporation
    Inventors: Ralph W. MacKenzie, Tyler J. DeLong, Ryan P. Gingras