Granted Patent
Utility
US 4,676,965 · App. 06/751,833
Process for producing high purity silicon nitride
Inventor:
Clarence D. Vanderpool
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Jul 5, 1985
Inventor
Clarence D. Vanderpool
Assignee (at issue)
GTE Products 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.