Granted Patent
Utility
US 4,220,271 · App. 06/029,403
Device for replacing pouring tubes
Inventor:
Stanislav Szadkowski
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: Apr 12, 1979
Inventor
Stanislav Szadkowski
Assignee (at issue)
Vesuvius International 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.