Granted Patent
Utility
US 5,773,631 · App. 08/606,896
3-arylbenzofuranones as stabilizers
Inventors:
Peter Nesvadba, Samuel Evans, Christoph Krohnke, Jurg Zingg
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Feb 26, 1996
Inventors
Peter Nesvadba
Samuel Evans
Christoph Krohnke
Jurg Zingg
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.