Granted Patent
Utility
US 5,385,674 · App. 08/068,630
Process for separation of petroleum emulsions of the water-in-oil type
Inventors:
Rainer Kupfer, Martin Hille, Roland Bohm, Friedrich Staiss
Patented Case
View Patent ↗
Granted: Jan 31, 1995
Filed: May 27, 1993
Inventors
Rainer Kupfer
Martin Hille
Roland Bohm
Friedrich Staiss
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.