Granted Patent
Utility
US 5,344,801 · App. 08/069,692
High zirconia fused cast refractory
Inventors:
Otojiro Kida, Toshihiro Ishino
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: May 28, 1993
Inventors
Otojiro Kida
Toshihiro Ishino
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.