Granted Patent
Utility
US 5,658,875 · App. 08/557,151
Ultramild surfactant mixtures
Inventors:
Brigitte Giesen, Wolfgang Pittermann, Karl Schmid, Walter Sterzel
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Dec 14, 1995
Inventors
Brigitte Giesen
Wolfgang Pittermann
Karl Schmid
Walter Sterzel
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.