Granted Patent
Utility
US 4,433,979 · App. 06/353,311
Abrasion resistant silicon nitride based articles
Inventors:
Vinod K. Sarin, Robert A. Penty, Sergej-Tomislav Buljan
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Mar 1, 1982
Inventors
Vinod K. Sarin
Robert A. Penty
Sergej-Tomislav Buljan
Assignee (at issue)
GTE Laboratories Incorporated
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.