Granted Patent
Utility
US 5,491,245 · App. 08/213,355
Method for the synthesis of amphoteric surfactants
Inventors:
Burghard Gruning, Christian Weitemeyer
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Mar 15, 1994
Inventors
Burghard Gruning
Christian Weitemeyer
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.