Granted Patent
Utility
US 4,309,546 · App. 06/143,387
Piperidino pyrrolidinones
Inventor:
Friedrich Karrer
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Apr 24, 1980
Inventor
Friedrich Karrer
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.