Granted Patent
Utility
US 5,352,247 · App. 08/159,408
Anthraquinone dyes, their preparation and their use
Inventor:
Jean-Marie Adam
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Nov 30, 1993
Inventor
Jean-Marie Adam
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.