Granted Patent
Utility
US 4,745,231 · App. 06/893,756
Alkylene oxide block polymers usable as defoamers
Inventors:
Fritz Lange, Rainer Hoefer, Karl Schmid, Adolf Asbeck, Klaus Herrmann
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: Aug 6, 1986
Inventors
Fritz Lange
Rainer Hoefer
Karl Schmid
Adolf Asbeck
Klaus Herrmann
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.