Granted Patent
Utility
US 4,668,790 · App. 06/449,955
Chromogenic dihydrofuropyridinones
Inventors:
Davor Bedekovic, Ian J. Fletcher
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Dec 15, 1982
Inventors
Davor Bedekovic
Ian J. Fletcher
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.