Granted Patent
Utility
US 6,121,331 · App. 09/202,082
Aqueous nacreous luster concentrates
Inventors:
Achim Ansmann, Rolf Kawa
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: May 19, 1999
Inventors
Achim Ansmann
Rolf Kawa
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.