Granted Patent
Utility
US 5,500,475 · App. 08/240,729
Polyurethane-based thickeners
Inventors:
Ulrich Eicken, Herbert Fischer, Wolfgang Gress, Rainer Hoefer, Doris Oberkobusch, Ludwig Schieferstein
Patented Case
View Patent ↗
Granted: Mar 19, 1996
Filed: May 10, 1994
Inventors
Ulrich Eicken
Herbert Fischer
Wolfgang Gress
Rainer Hoefer
Doris Oberkobusch
Ludwig Schieferstein
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.