Granted Patent
Utility
US 5,134,098 · App. 07/824,219
Method of producing mullite/yttria stabilized zirconia/boron nitride composites
Inventor:
Gregory W. Shaffer
Patented Case
View Patent ↗
Granted: Jul 28, 1992
Filed: Jan 23, 1992
Inventor
Gregory W. Shaffer
Assignee (at issue)
Union Carbide Coatings Service Technology 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.