Granted Patent
Utility
US 5,041,634 · App. 07/278,395
Process for the preparation of carboxylated aromatic hydroxy compounds
Inventors:
Martin Clausen, Paul Rys, Junkuan Wang
Patented Case
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Granted: Aug 20, 1991
Filed: Dec 1, 1988
Inventors
Martin Clausen
Paul Rys
Junkuan Wang
Assignee (at issue)
Ciba-Geigy
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.