Granted Patent
Utility
US 5,008,459 · App. 07/136,686
Substituted phenols as stabilizers
Inventors:
Hans-Rudolf Meier, Samuel Evans, Paul Dubs
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Dec 22, 1987
Inventors
Hans-Rudolf Meier
Samuel Evans
Paul Dubs
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.