Granted Patent
Utility
US 4,409,142 · App. 06/253,684
Disazo compounds having a 5-amino or hydroxy-3-carboxy or methyl-1-substituted phenylphyrazole coupling component radical
Inventor:
Heinz Wicki
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Apr 13, 1981
Inventor
Heinz Wicki
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.