Granted Patent
Utility
US 5,470,992 · App. 08/212,540
Method for the synthesis of betaines containing.ltoreq.10 ppm of organically bound chlorine
Inventors:
Burghard Gruning, Willi Foitzik, Christian Weitemeyer, Hans-Dieter Kaseborn
Patented Case
View Patent ↗
Granted: Nov 28, 1995
Filed: Mar 14, 1994
Inventors
Burghard Gruning
Willi Foitzik
Christian Weitemeyer
Hans-Dieter Kaseborn
Assignee (at issue)
Th. Goldschmidt. AG
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.