Granted Patent
Utility
US 4,785,089 · App. 06/869,799
Novel sulfonic acid esters and their preparation
Inventors:
Hans Blaser, Hans-Peter Jalett, Gottfried Sedelmeier
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Jun 2, 1986
Inventors
Hans Blaser
Hans-Peter Jalett
Gottfried Sedelmeier
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.