Solid precursor of a catalytic system for the polymerization of olefins, process for its preparation, catalytic system comprising this solid precursor and process for the polymerization of olefins in the presence of this catalytic system

Granted: Jun 9, 1998 Filed: Feb 15, 1996

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.