Granted Patent
Utility
US 5,247,113 · App. 07/638,602
Araliphatic sulfonium and their use
Inventors:
Martin Roth, Beat Muller
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Jan 7, 1991
Inventors
Martin Roth
Beat Muller
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.