Patents by Inventor Witold Kostrzewski

Witold Kostrzewski 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).

  • Solid thermoplastic surfacing material
    Patent number: 5856389
    Abstract: A solid thermoplastic filler-filled surfacing material having a deep semi-translucent appearance, in the form of a thin, rigid sheet contains 19-25% polymethyl methacrylate, 19-25% styrene acrylonitrile copolymer, 5-20% styrene maleic anhydride copolymer, and 30-60% finely divided filler of barium sulfate, kaolin, basic aluminum oxalate and/or wollastonite.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: January 5, 1999
    Assignee: International Paper
    Inventors: Witold Kostrzewski, Leonard Elbon, Robin D. O'Dell, Eric Franzoi