Granted Patent
Utility
US 5,012,003 · App. 07/264,286
Process for preparing dithiobisphenols
Inventors:
David H. Steinberg, John J. Luzzi
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Oct 28, 1988
Inventors
David H. Steinberg
John J. Luzzi
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.