Granted Patent
Utility
US 4,820,756 · App. 07/065,226
Thioether substituted phenols and their use as stabilizers
Inventors:
Rita Pitteloud, Paul Dubs
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jun 22, 1987
Inventors
Rita Pitteloud
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.