Granted Patent
Utility
US 4,825,005 · App. 07/088,740
Process for the preparation of aromatic ether and thioether compounds
Inventors:
Christian Frey, Bernd Dill
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Aug 24, 1987
Inventors
Christian Frey
Bernd Dill
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.