Granted Patent
Utility
US 5,180,508 · App. 07/564,873
Fabric softener rinsing agents
Inventors:
Horst Birkhan, Hans-Juergen Kohle, Joachim Weigand, Winfried Wehner
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Aug 9, 1990
Inventors
Horst Birkhan
Hans-Juergen Kohle
Joachim Weigand
Winfried Wehner
Assignee (at issue)
Rewo Chemische Werke 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.