Granted Patent
Utility
US 4,918,086 · App. 07/224,623
1-nitro-2,2-diaminoethylene derivatives
Inventor:
Laurenz Gsell
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jul 27, 1988
Inventor
Laurenz Gsell
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.