Granted Patent
Utility
US 5,210,281 · App. 07/720,444
Dry neutralization process for organic liquid phases
Inventors:
Wolfgang Ritter, Hans-Dieter Sitz, Ludwig Speitkamp
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Aug 23, 1991
Inventors
Wolfgang Ritter
Hans-Dieter Sitz
Ludwig Speitkamp
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.