Granted Patent
Utility
US 5,520,848 · App. 08/385,020
Mixtures and compositions containing phenothiazines
Inventor:
Samuel Evans
Patented Case
View Patent ↗
Granted: May 28, 1996
Filed: Feb 7, 1995
Inventor
Samuel Evans
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.