Granted Patent
Utility
US 5,962,708 · App. 08/977,939
Process for preparation of highly concentrated free-flowing aqueous solutions of betaines
Inventors:
Ingo Hamann, Hans-Jurgen Kohle, Winfried Wehner
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Nov 24, 1997
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.