Granted Patent
Utility
US 6,713,421 · App. 10/049,661
Blank comprised of a zirconium oxide ceramic with an oxide additive and the use thereof
Inventors:
Holger Hauptmann, Robert Schnagl, Sybille Frank
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Apr 11, 2002
Inventors
Holger Hauptmann
Robert Schnagl
Sybille Frank
Assignee (at issue)
3M ESPE 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.