Granted Patent
Utility
US 5,631,357 · App. 08/553,313
Nonionic emulsifiers
Inventors:
Manfred Weuthen, Petra Riegels, Irmgard Hartel
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: Jan 26, 1996
Inventors
Manfred Weuthen
Petra Riegels
Irmgard Hartel
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.