Granted Patent
Utility
US 4,234,734 · App. 06/057,628
2,2,6,6-Tetramethylpiperidine derivatives
Inventor:
Friedrich Karrer
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Jul 16, 1979
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.