Granted Patent
Utility
US 5,466,643 · App. 08/189,735
High zirconia fused cast refractories
Inventors:
Toshihiro Ishino, Otojiro Kida, Yoshihisa Beppu
Patented Case
View Patent ↗
Granted: Nov 14, 1995
Filed: Feb 1, 1994
Inventors
Toshihiro Ishino
Otojiro Kida
Yoshihisa Beppu
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.