Patents by Inventor Peter Friel

Peter Friel 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).

  • Cleaning material for extruders
    Patent number: 6673759
    Abstract: The invention relates to a cleaning composition for apparatus for processing thermoplastic melts, which composition essentially comprises discrete particles capable of plastic deformation and made from a thermoplastic (A) with a melting point above 200° C. and with a crystallinity of not more than 50%, and comprises an amorphous or semicrystalline thermoplastic (B) with a processing temperature below the melting point of the thermoplastic (A). The proportion of the thermoplastic (A) is from 1 to 95% by weight and that of the thermoplastic (B) is from 5 to 95% by weight. The total of the percentage proportions by weight of (A) and (B) is always 100% or less.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: January 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Uwe Koch, Rainer Klenz, Peter Friel, Brigitte Gareiss