Granted Patent
Utility
US 5,935,274 · App. 09/056,652
Mixtures of monoazopyridone dyes
Inventor:
Jurgen Schaetzer
Patented Case
View Patent ↗
Granted: Aug 10, 1999
Filed: Mar 18, 1998
Inventor
Jurgen Schaetzer
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.