Granted Patent
Utility
US 4,964,993 · App. 06/661,543
Multiple-use molten metal filters
Inventor:
Edwin P. Stankiewicz
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Oct 16, 1984
Inventor
Edwin P. Stankiewicz
Assignee (at issue)
Stemcor Corporation
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.