Granted Patent
Utility
US 5,053,370 · App. 07/386,549
Aluminum oxide ceramics having improved mechanical properties
Inventor:
Philip L. Berneburg
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Jul 27, 1989
Inventor
Philip L. Berneburg
Assignee (at issue)
W.R. Grace & Co. Conn.
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.