Granted Patent
Utility
US 6,223,552 · App. 09/355,176
Device for the controlled cooling of hot-briquetted directly reduced iron sponge
Inventors:
Karl-Heinz Zimmerbauer, Helmut Schober, Franz Hoertnagl, Wolfgang Tscherne
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Aug 4, 1999
Inventors
Karl-Heinz Zimmerbauer
Helmut Schober
Franz Hoertnagl
Wolfgang Tscherne
Assignee (at issue)
Voest-Alpine Industrieanlagenbau GmbH & Co.
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.