Granted Patent
Utility
US 4,289,686 · App. 06/076,106
Tetra-alkyl piperidine derivatives as light stabilizers
Inventors:
Jean Rody, Mario Slongo
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Sep 17, 1979
Inventors
Jean Rody
Mario Slongo
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.