Patents by Inventor Hans D. Heinen

Hans D. Heinen 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).

  • Fire door assembly
    Patent number: 4160421
    Abstract: A fire door assembly for providing access to an enclosed space such as a furnace, fireplace, duct, tank or cistern including a movable flap having peripheral portions which can be positioned flush against a wall so as to close an access opening. A gasket or seal is provided along the access opening on the face of the outer wall.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: July 10, 1979
    Assignee: Intellectual Trade Cy S.A.
    Inventor: Hans D. Heinen