Granted Patent
Utility
US 4,238,613 · App. 05/951,218
Polyalkylpiperidine derivatives
Inventors:
Michael Rasberger, Friedrich Karrer
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Oct 13, 1978
Inventors
Michael Rasberger
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.