Granted Patent
Utility
US 4,287,348 · App. 05/912,702
Preparation of sulphoalkyl quaternary salts
Inventors:
Rainer Kitzing, Geoffrey E. Ficken, Victor W. Dolden
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jun 5, 1978
Inventors
Rainer Kitzing
Geoffrey E. Ficken
Victor W. Dolden
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.