Granted Patent
Utility
US 4,950,328 · App. 07/376,402
End mill formed of tungsten carbide-base sintered hard alloy
Inventors:
Niro Odani, Katsuhisa Yamamoto, Hitoshi Mayumi
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Jul 6, 1989
Inventors
Niro Odani
Katsuhisa Yamamoto
Hitoshi Mayumi
Assignee (at issue)
Mitsubishi Metal 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.