Granted Patent
Utility
US 5,623,039 · App. 08/500,658
Cycloolefin polymers
Inventors:
Wilfried Hatke, Frank Osan
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Jul 11, 1995
Inventors
Wilfried Hatke
Frank Osan
Assignee (at issue)
Hoechst GmbH
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.