Granted Patent
Utility
US 4,562,449 · App. 06/679,416
Chromogenic dihydroquinazolines
Inventors:
Heinz Balli, Sigmund Gunzenhauser, Ian J. Fletcher, Davor Bedekovic
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Dec 7, 1984
Inventors
Heinz Balli
Sigmund Gunzenhauser
Ian J. Fletcher
Davor Bedekovic
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.