Granted Patent
Utility
US 5,663,309 · App. 08/567,610
Diazo dyes having a phenylene group as the middle component and a naphthalene group as the terminal diazo component
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Sep 2, 1997
Filed: Dec 5, 1995
Inventor
Rudolf Hurter
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.