Granted Patent
Utility
US 6,524,548 · App. 09/067,915
Zirconium dioxide powder, method of its production and use
Inventors:
Helmut Mangold, Werner Hartmann, Dieter Kerner, Peter Kleinschmit
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Apr 29, 1998
Inventors
Helmut Mangold
Werner Hartmann
Dieter Kerner
Peter Kleinschmit
Assignee (at issue)
Degussa AG
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.