Granted Patent
Utility
US 5,604,247 · App. 08/632,971
Chromone Derivatives
Inventors:
Andreas von Sprecher, Marc Gerspacher, Robert Mah, Silvio Roggo, Walter Schilling, Silvio Ofner, Siem Jacob Veenstra
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Apr 16, 1996
Inventors
Andreas von Sprecher
Marc Gerspacher
Robert Mah
Silvio Roggo
Walter Schilling
Silvio Ofner
Siem Jacob Veenstra
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.