Granted Patent
Utility
US 6,586,122 · App. 09/903,561
Multilayer-coated cutting tool
Inventors:
Takeshi Ishikawa, Nobuhiko Shima
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Jul 13, 2001
Inventors
Takeshi Ishikawa
Nobuhiko Shima
Assignee (at issue)
HITACHI TOOL ENGINEERING, LTD.
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.