Patents by Inventor Wilhelm Bertram

Wilhelm Bertram 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).

  • Applicator for hot-melt adhesive
    Patent number: 4601597
    Abstract: A hot-melt adhesive applicator with a heating block features a flow maze for the hot-melt adhesive, arranged between heating block and applicator nozzle, which is formed, for one, by parts of the heating block, and, for another, by a detachable maze attachment, and causes the hot-melt adhesive to flow through thin ribbon or disk-shaped spaces in intimate contact with heated surfaces, with all essential adhesive channels being easily accessible for cleaning upon removal of the maze attachment.
    Type: Grant
    Filed: May 10, 1984
    Date of Patent: July 22, 1986
    Assignee: Heinrich Buhnen KG
    Inventors: Wilhelm Bertram, Alfred Bottcher, Carl Siegmann