Patents by Inventor Daniel J. Hoffmann

Daniel J. Hoffmann 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).

  • Integral composite profile of cellular and non-cellular resins and a dual extrusion method for its manufacture
    Patent number: 4690862
    Abstract: The dual extrusion and fusion of cellular and non-cellular resin extrudates produces an integral composite profile having a tongue and groove interlock. The resins are extruded through a common die having overlapping orifices. A bulbous tongue of one extrudate is encapsulated by finger-like projections of a second extrudate and the mated profiles are pulled through a vacuumized sizing box adapted to sealingly receive the cellular portion and to freely receive the non-cellular portion.
    Type: Grant
    Filed: December 28, 1984
    Date of Patent: September 1, 1987
    Assignee: Gossen Corporation
    Inventor: Daniel J. Hoffmann