Patents by Inventor Norbert A. Langwald

Norbert A. Langwald 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).

  • Stabilized carbon monoxide-olefin copolymers
    Patent number: 5371127
    Abstract: Polyketone compositions can be stabilized by the addition of a suitable stabilizing amount of a blend of a hindered phenol compound, such as a thioester-containing hindered phenol and an epoxy compound (such as an epoxy cycloaliphatic carboxylate).
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: December 6, 1994
    Assignee: Akzo Nobel N.V.
    Inventors: Andrzej M. Piotrowski, Norbert A. Langwald