Granted Patent
Utility
US 5,973,173 · App. 08/844,804
Process for concentrating azelaic acid
Inventors:
Horst Josten, Wilhelm Johannisbauer, Manfred Lindemann, Dennis G. Gaige, Kenneth R. McVay
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Apr 22, 1997
Inventors
Horst Josten
Wilhelm Johannisbauer
Manfred Lindemann
Dennis G. Gaige
Kenneth R. McVay
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.