Patents by Inventor Nicolaas H. Friederichs

Nicolaas H. Friederichs 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).

  • Catalyst system for the polymerization of ethylene
    Patent number: 6031056
    Abstract: The invention relates to the preparation of the disclosed catalyst system and to the homo- or copolymerization of ethylene with the aid of this catalyst system. The catalyst system contains a catalyst A and a cocatalyst B which, system is suitable for the homopolymerization of ethylene or copolymerization of ethylene with one or more .alpha.-olefins having 3-12 carbon atoms and optionally one or more non-conjugated dienes. Catalyst A contains one or more organomagnesium compounds, one or more transition metal compounds, and one or more halides that do not react spontaneously with the organomagnesium compound(s). The catalyst system also contains at least one transfer agent.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: February 29, 2000
    Assignee: DSM N.V.
    Inventors: Nicolaas H. Friederichs, Johannes A. M. van Beek, Joseph A. J. Hahnraths, Rutgerus A. J. Postema
  • Process for polymerizing ethylene in the presence of a catalyst composition
    Patent number: 5777050
    Abstract: A process is disclosed for the homopolymerization of ethylene or copolymerization of ethylene with one or more .alpha.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: July 7, 1998
    Assignee: DSM N.V.
    Inventors: Nicolaas H. Friederichs, Johannus A. M. van Beek, Rutgerus A. J. Postema, Joseph A. J. Hahnraths