Granted Patent
Utility
US 5,147,928 · App. 07/660,252
Preparation of propylene-ethylene copolymers
Inventors:
Juergen Kerth, Harald Schwager, Ralf Zolk
Patented Case
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Granted: Sep 15, 1992
Filed: Feb 25, 1991
Inventors
Juergen Kerth
Harald Schwager
Ralf Zolk
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.