Granted Patent
Utility
US 5,066,546 · App. 07/449,094
Wear-resistant steel castings
Inventor:
James P. Materkowski
Patented Case
View Patent ↗
Granted: Nov 19, 1991
Filed: Dec 8, 1989
Inventor
James P. Materkowski
Assignee (at issue)
KENNAMETAL INC.
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.