Granted Patent
Utility
US 4,439,615 · App. 06/399,502
Mercaptophenol stabilizers
Inventors:
Siegfried Rosenberger, Samuel Evans, Bernard Gilg
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Jul 19, 1982
Inventors
Siegfried Rosenberger
Samuel Evans
Bernard Gilg
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.