Granted Patent
Utility
US 6,589,331 · App. 10/103,839
Soft iron pigments
Inventors:
Werner Ostertag, Stefan Trummer, Frank Henglein, Klaus Greiwe
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Mar 25, 2002
Inventors
Werner Ostertag
Stefan Trummer
Frank Henglein
Klaus Greiwe
Assignee (at issue)
Eckart GmbH & Co. KG
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.