Granted Patent
Utility
US 5,464,565 · App. 08/321,141
Process for the preparation of highly concentrated free-flowing aqueous solutions of betaines
Inventors:
Ingo Hamann, Hans-Jurgen Kohle, Winfried Wehner
Patented Case
View Patent ↗
Granted: Nov 7, 1995
Filed: Oct 11, 1994
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.