Granted Patent
Utility
US 5,252,643 · App. 07/903,647
Thiomethylated benzofuran-2-ones
Inventor:
Peter Nesvadba
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jun 24, 1992
Inventor
Peter Nesvadba
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.