Granted Patent
Utility
US 5,681,972 · App. 08/413,190
Process for preparing highly concentrated, free-flowing aqueous solutions of betaines
Inventors:
Ingo Hamann, Hans-Jurgen Kohle, Winfried Wehner
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: Mar 30, 1995
Inventors
Ingo Hamann
Hans-Jurgen Kohle
Winfried Wehner
Assignee (at issue)
Witco Surfactants GmbH
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.