Granted Patent
Utility
US 4,898,368 · App. 07/236,788
Wear resistant metallurgical tuyere
Inventors:
Paul J. Schaffer, Robert C. Tucker, Jr.
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Aug 26, 1988
Inventors
Paul J. Schaffer
Robert C. Tucker, Jr.
Assignee (at issue)
Union Carbide 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.