Granted Patent
Utility
US 5,606,034 · App. 08/389,371
Process for the preparation of azo dyes
Inventors:
Horst Langfeld, Karl Friedrich Haarburger, Herbert Mauser
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Feb 16, 1995
Inventors
Horst Langfeld
Karl Friedrich Haarburger
Herbert Mauser
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.