Granted Patent
Utility
US 4,728,464 · App. 06/486,033
1-amino-4-(3'-phenylsulphonyl-aminophenylamino) anthraquinone-2-sulphonic acids useful as anionic dyestuffs
Inventor:
Roland Mislin
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Apr 18, 1983
Inventor
Roland Mislin
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.