Granted Patent
Utility
US 5,158,737 · App. 07/692,697
Apparatus for refining molten aluminum
Inventor:
Andrew Stein
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Apr 29, 1991
Inventor
Andrew Stein
Assignee (at issue)
Altec Engineering, 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.