Granted Patent
Utility
US 5,225,545 · App. 07/881,580
Disazo dyes containing a 1-hydroxy-3-sulfo-acylaminophenyl-amino-naphthalene coupling component
Inventor:
Urs Lauk
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: May 12, 1992
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.