Toughened ceramic composite materials comprising coated refractory fibers in a ceramic matrix wherein the fibers are coated with carbon and an additional coating of ceramic material and carbon mixture

Granted: Jan 2, 1996 Filed: Oct 6, 1993

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.