Granted Patent
Utility
US 5,072,055 · App. 07/594,876
Process for the preparation of substituted phenols
Inventors:
Hugo Illy, Ronald Salathe, Rudolf Schwabe
Patented Case
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Granted: Dec 10, 1991
Filed: Oct 9, 1990
Inventors
Hugo Illy
Ronald Salathe
Rudolf Schwabe
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.