Granted Patent
Utility
US 6,139,747 · App. 09/212,823
Process for cleaning up wastewaters from the preparation of alcohols
Inventors:
Mariola Rötzheim, Wolfgang Zgorzelski
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Dec 16, 1998
Inventors
Mariola Rötzheim
Wolfgang Zgorzelski
Assignee (at issue)
Celanese 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.