Granted Patent
Utility
US 6,428,846 · App. 09/323,632
Corrosion-stable aluminum pigments and process for the production thereof
Inventors:
Günter Kaupp, Werner Ostertag, Gunter Sommer
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Jun 1, 1999
Inventors
Günter Kaupp
Werner Ostertag
Gunter Sommer
Assignee (at issue)
Eckart-Werke Standard Bronzepūlver-Werke Carl-Eckart GmbH & Co.
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.