Granted Patent
Utility
US 4,587,539 · App. 06/690,075
Chromogenic dihydrofuropyridinones
Inventors:
Davor Bedekovic, Ian J. Fletcher
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Jan 9, 1985
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.