Granted Patent
Utility
US 6,223,806 · App. 09/520,882
Apparatus and method for bottom casting of molten steel
Inventors:
Kazuhisa Nishino, Eiju Hayakawa
Patented Case
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Granted: May 1, 2001
Filed: Apr 5, 2000
Inventors
Kazuhisa Nishino
Eiju Hayakawa
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.