Granted Patent
Utility
US 4,929,771 · App. 07/278,396
Process for the preparation of alkyl-substituted phenols or naphthols
Inventors:
Martin Clausen, Paul Rys, Wang Junkuan
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Dec 1, 1988
Inventors
Martin Clausen
Paul Rys
Wang Junkuan
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.