Granted Patent
Utility
US 6,006,822 · App. 09/108,466
Controllable variable magnetic field apparatus for flow control of molten steel in a casting mold
Inventors:
William R. Frank, Jonathan Dorricott
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Jul 1, 1998
Inventors
William R. Frank
Jonathan Dorricott
Assignee (at issue)
IPSCO Enterprises, Inc.
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.