Patents by Inventor Henry Szywalla

Henry Szywalla 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).

  • Film winding mechanism and display apparatus
    Patent number: 5606814
    Abstract: A poster display apparatus winds a film carrying the posters between spools. The surface speeds of rotation of the spools are equalized by a rising and falling weight carried by a cord interconnecting pulleys carried by the spool axles.
    Type: Grant
    Filed: August 14, 1995
    Date of Patent: March 4, 1997
    Assignee: Adverite PLC
    Inventors: Henry Szywalla, James Melville