Granted Patent
Utility
US 5,216,052 · App. 07/903,646
Bisbenzofuran-2-ones
Inventors:
Peter Nesvadba, Carla Attinger-Sorato
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jun 24, 1992
Inventors
Peter Nesvadba
Carla Attinger-Sorato
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.