Granted Patent
Utility
US 5,631,393 · App. 08/433,315
Palladium catalysts containing sulfonated bisphosphines as ligands, process for their preparation and their use in carbonylation reactions
Inventors:
Christian Kohlpaintner, Matthias Beller
Patented Case
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Granted: May 20, 1997
Filed: May 2, 1995
Inventors
Christian Kohlpaintner
Matthias Beller
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.