Granted Patent
Utility
US 4,699,939 · App. 06/916,575
Ortho cyclohexyl, para hydroxy aralkanoic acid esters and amide antioxidants
Inventors:
Ivan Orban, Hans-Rudolf Meier, Paul Dubs, Samuel Evans, Peter Hofmann
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Oct 8, 1986
Inventors
Ivan Orban
Hans-Rudolf Meier
Paul Dubs
Samuel Evans
Peter Hofmann
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.