Granted Patent
Utility
US 4,719,051 · App. 06/896,561
Process for the preparation of 4,4'-dinitrostilbene-2,2'-disulfonic acid and its salts
Inventor:
Leonardo Guglielmetti
Patented Case
View Patent ↗
Granted: Jan 12, 1988
Filed: Aug 13, 1986
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.