Granted Patent
Utility
US 5,573,742 · App. 07/114,691
Method for the preparation of high purity aluminum nitride
Inventor:
Joseph J. Gebhardt
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Oct 29, 1987
Inventor
Joseph J. Gebhardt
Assignee (at issue)
LOCKHEED MARTIN CORPORATION
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.