Granted Patent
Utility
US 5,175,312 · App. 07/754,180
3-phenylbenzofuran-2-ones
Inventors:
Paul Dubs, Rita Pitteloud
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Aug 27, 1991
Inventors
Paul Dubs
Rita Pitteloud
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.