Granted Patent
Utility
US 5,141,289 · App. 07/799,687
Cemented carbide tip
Inventor:
Stephen P. Stiffler
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Nov 22, 1991
Inventor
Stephen P. Stiffler
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.