Granted Patent
Utility
US 4,861,920 · App. 07/167,807
Process for the preparation of 2,6-dihydroxynaphthalene
Inventors:
Martin Clausen, Paul Rys
Patented Case
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Granted: Aug 29, 1989
Filed: Mar 14, 1988
Inventors
Martin Clausen
Paul Rys
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.