Granted Patent
Utility
US 6,090,190 · App. 09/209,286
Closure systems for chromatographic columns
Inventors:
Alfons Enhsen, Ralf Watkowiak
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Dec 11, 1998
Inventors
Alfons Enhsen
Ralf Watkowiak
Assignee (at issue)
Hoechst Marion Roussel Deutschland 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.