Granted Patent
Utility
US 4,473,489 · App. 06/481,693
Aqueous flowable surfactant concentrates and process therefor
Inventors:
Bernhard Bartnick, Werner Erwied, Rainer Hofer
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Apr 4, 1983
Inventors
Bernhard Bartnick
Werner Erwied
Rainer Hofer
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.