Granted Patent
Utility
US 4,340,209 · App. 06/253,572
Adjustable tuyere
Inventor:
David J. Abascal
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Apr 13, 1981
Inventor
David J. Abascal
Assignee (at issue)
Kaiser Steel 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.