Granted Patent
Utility
US 4,904,625 · App. 06/914,931
Refractory composites of alumina and boron nitride
Inventor:
Gregory W. Shaffer
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Oct 3, 1986
Inventor
Gregory W. Shaffer
Assignee (at issue)
Union Carbide 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.