Granted Patent
Utility
US 5,312,974 · App. 07/778,825
Process for the production of light-colored lower alkane-sulfonic acids, more particularly methanesulfonic acid
Inventors:
Willi Wuest, Rainer Eskuchen, Christoph Lohr
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Dec 19, 1991
Inventors
Willi Wuest
Rainer Eskuchen
Christoph Lohr
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.