Granted Patent
Utility
US 4,667,385 · App. 06/768,854
Lance for stirring molten metal and method of making the same
Inventors:
James Colzani, Nelson H. Kehl
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Aug 23, 1985
Inventors
James Colzani
Nelson H. Kehl
Assignee (at issue)
MIDWEST INSTRUMENT COMPANY
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.