Granted Patent
Utility
US 5,290,952 · App. 07/906,607
Phenylthiophenyl ketones
Inventors:
David G. Leppard, Kurt Burdeska
Patented Case
View Patent ↗
Granted: Mar 1, 1994
Filed: Jun 30, 1992
Inventors
David G. Leppard
Kurt Burdeska
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.