Granted Patent
Utility
US 5,330,328 · App. 08/013,097
Submersible molten metal pump
Inventor:
Paul V. Cooper
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Feb 3, 1993
Inventor
Paul V. Cooper
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.