Granted Patent
Utility
US 5,681,526 · App. 08/636,329
Method and apparatus for post-combustion of gases during the refining of molten metal
Inventor:
Xiaodong Zhang
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: Apr 23, 1996
Inventor
Xiaodong Zhang
Assignee (at issue)
USX Corporation
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.