Granted Patent
Utility
US 5,227,478 · App. 07/825,362
"2-chloro-4-[4'-(4"",8""-disulfonaphth-2""-ylazo)-2'-methoxy-5'-methylanilino]- 6"
Inventor:
Werner Koch
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jan 24, 1992
Inventor
Werner Koch
Assignee (at issue)
Sandoz AG
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.