Granted Patent
Utility
US 4,367,172 · App. 06/212,826
Disazo dyes containing at least one sulfo group and at least two basic or cationic groups
Inventor:
Reinhard Pedrazzi
Patented Case
View Patent ↗
Granted: Jan 4, 1983
Filed: Dec 4, 1980
Inventor
Reinhard Pedrazzi
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.