Granted Patent
Utility
US 5,602,238 · App. 08/519,226
Azothiophene dyes containing a 2,4,6-triamino-3-cyanopyridine coupling component
Inventor:
J urgen Schaetzer
Patented Case
View Patent ↗
Granted: Feb 11, 1997
Filed: Aug 25, 1995
Inventor
J urgen Schaetzer
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.