Granted Patent
Utility
US 5,500,124 · App. 07/984,698
Process for the purifying working-up of reaction media and/or wash media obtained during preparation of cellulose ethers
Inventors:
Heinz Wallisch, Reinhard Donges, Ulrich Meyer-Blumenroth
Patented Case
View Patent ↗
Granted: Mar 19, 1996
Filed: Dec 3, 1992
Inventors
Heinz Wallisch
Reinhard Donges
Ulrich Meyer-Blumenroth
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.