Granted Patent
Utility
US 5,840,993 · App. 08/981,261
Water-soluble cobalt catalysts, process for their preparation and their use as hydro-formylation catalysts in a two-phase system with polyethylene glycol as the polar phase
Inventors:
Uwe Ritter, Norbert Winkhofer, Herbert Roesky
Patented Case
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Granted: Nov 24, 1998
Filed: Feb 26, 1998
Inventors
Uwe Ritter
Norbert Winkhofer
Herbert Roesky
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.