Granted Patent
Utility
US 5,254,270 · App. 07/850,578
Fabric softeners based on quaternary poly(oxyalkylene) alkanolamine esters
Inventors:
Horst Birkhan, Michael Fender
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Mar 13, 1992
Inventors
Horst Birkhan
Michael Fender
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.