Granted Patent
Utility
US 5,643,419 · App. 08/487,476
Method of optimizing the control of the mass transfer zone in distillation columns
Inventor:
Hermann Rathert
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 7, 1995
Inventor
Hermann Rathert
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.