Granted Patent
Utility
US 4,532,279 · App. 06/571,980
Polyalkylpiperidine esters of aliphatic tetracarboxylic acids
Inventor:
Friedrich Karrer
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: Jan 19, 1984
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.