Granted Patent
Utility
US 5,616,733 · App. 08/472,400
Preparation method for 2-coumaranone
Inventors:
Jean-Claude Vallejos, Alain Perrard, Yani Christidis, Pierre Gallezot
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Jun 7, 1995
Inventors
Jean-Claude Vallejos
Alain Perrard
Yani Christidis
Pierre Gallezot
Assignee (at issue)
Societe Francaise Hoechst
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.