Granted Patent
Utility
US 5,229,472 · App. 07/897,140
Anionic extruder polymerization process
Inventors:
Frederik L. Binsbergen, Ulrich Berghaus, Willem Sjardijn
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Jun 11, 1992
Inventors
Frederik L. Binsbergen
Ulrich Berghaus
Willem Sjardijn
Assignee (at issue)
SHELL OIL COMPANY
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.