Granted Patent
Utility
US 5,839,500 · App. 08/992,645
Apparatus for improving the quality of continously cast metal
Inventors:
Rudolf Roder, Marcel Witschi
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Dec 16, 1997
Inventors
Rudolf Roder
Marcel Witschi
Assignee (at issue)
Lauener Engineering, 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.