Patents by Inventor Marcel A. Werner

Marcel A. Werner 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).

  • Colored polyethylene terephthalate moulding compound and moulded products made therefrom
    Patent number: 4394470
    Abstract: A polyethylene terephthalate moulding composition is disclosed having uniformly dispersed therein 10-25,000 ppm of caramel as a colorant. The colorant is non-toxic, does not affect the transparency of the polyester, and does not cause aldehyde formation. The caramel may have been formed in situ from a mono- or disaccharide which has been added to the bis(beta-hydroxyethyl)terephthalate before or during polycondensation or to the molten polyester. The color may have been intensified by adding an alkaline reacting compound. The composition may moreover contain further colorants. The composition is particularly suitable for use in the manufacture of food containers such as boxes, trays and bottles.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: July 19, 1983
    Assignee: Akzo N.V.
    Inventors: Marcel A. Werner, Arnold Venema, Michael G. H. Pisters