Granted Patent
Utility
US 5,041,632 · App. 07/203,850
Process for the preparation of 4,4'-dinitrostilbene-2,2-disulfonic acid
Inventor:
Leonardo Guglielmetti
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Jun 7, 1988
Inventor
Leonardo Guglielmetti
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.