Patents by Inventor John Liberts

John Liberts 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).

  • Apparatus for wax impregnation
    Patent number: 4085701
    Abstract: Method and apparatus for applying wax to a cardboard box blank formed from board having substantially straight parallel open-ended internal interstices, in which a zone of cascading flow of wax impregnated material is generated and the box blank is passed through the zone with the board interstices open to the wax flow.
    Type: Grant
    Filed: November 20, 1974
    Date of Patent: April 25, 1978
    Assignee: Andax Pty. Ltd.
    Inventors: George Anson, John Liberts