Granted Patent
Utility
US 4,618,700 · App. 06/680,687
Process for the preparation of a hydroxyphenylcarboxylate
Inventors:
Erich Gubler, Max Siegrist
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Dec 12, 1984
Inventors
Erich Gubler
Max Siegrist
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.