Granted Patent
Utility
US 5,171,495 · App. 07/775,111
Immersion nozzles for metal melts
Inventors:
Ernst Luhrsen, Albert Ott
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Oct 11, 1991
Inventors
Ernst Luhrsen
Albert Ott
Assignee (at issue)
Didier-Werke AG
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.