Granted Patent
Utility
US 4,659,680 · App. 06/642,091
Stabilized zirconia bodies of improved toughness
Inventor:
Donald L. Guile
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Aug 20, 1984
Inventor
Donald L. Guile
Assignee (at issue)
Corning Glass Works
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.