Granted Patent
Utility
US 5,246,897 · App. 07/922,497
Powder mixture for monolithic refractories containing graphite and a method of making thereof
Inventors:
Yasushi Ono, Satoshi Sakamoto
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Jul 31, 1992
Inventors
Yasushi Ono
Satoshi Sakamoto
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.