Granted Patent
Utility
US 5,055,595 · App. 07/435,876
Etherified fluorescein compounds
Inventor:
Bernhard Wietfeld
Patented Case
View Patent ↗
Granted: Oct 8, 1991
Filed: Nov 14, 1989
Inventor
Bernhard Wietfeld
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.