Granted Patent
Utility
US 5,693,829 · App. 08/715,057
Benzofuran-2-ones as stabilizers
Inventors:
Peter Nesvadba, Samuel Evans
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Sep 17, 1996
Inventors
Peter Nesvadba
Samuel Evans
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.