Granted Patent
Utility
US 5,210,232 · App. 07/816,692
Pyran-containing phthalides
Inventor:
Rox Phaff
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Jan 2, 1992
Inventor
Rox Phaff
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.