Granted Patent
Utility
US 5,639,864 · App. 08/460,396
Azo dyes, containing a triazine middle component and a monoazo and a disazo dye radical
Inventor:
Urs Lauk
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Jun 2, 1995
Inventor
Urs Lauk
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.