Granted Patent
Utility
US 5,439,486 · App. 08/116,773
Triphenedioxazines, their preparation and the use thereof
Inventor:
Urs Lauk
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Sep 3, 1993
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.