Granted Patent
Utility
US 4,569,997 · App. 06/537,134
Polyalkylpiperidine compounds
Inventor:
Friedrich Karrer
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Sep 29, 1983
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.