Granted Patent
Utility
US 4,922,008 · App. 07/045,734
Process for the production of 4-nitrotoluene-2-sulfonic acid
Inventors:
Gottfried Seifert, Sebastian Staubli, Josef H. Wieland, Willy Regenass, Martin Buerli, John G. Lee, Richard B. Lund
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Apr 29, 1987
Inventors
Gottfried Seifert
Sebastian Staubli
Josef H. Wieland
Willy Regenass
Martin Buerli
John G. Lee
Richard B. Lund
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.