Granted Patent
Utility
US 4,833,169 · App. 07/228,849
Hydropyridine derivatives
Inventors:
Georg von Sprecher, Wolfgang Frostl, Armin Zust
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Aug 3, 1988
Inventors
Georg von Sprecher
Wolfgang Frostl
Armin Zust
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.