Granted Patent
Utility
US 5,656,236 · App. 08/711,062
Apparatus for gas treatment of molten metals
Inventors:
Peter Donald Waite, Robert Dumont
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Sep 9, 1996
Inventors
Peter Donald Waite
Robert Dumont
Assignee (at issue)
Alcan International Limited
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.