Granted Patent
Utility
US 5,663,000 · App. 08/090,924
Hard multilayer film formed material of titanium and carbon/silicon
Inventors:
Minoru Yamada, Shingo Kawamura
Patented Case
View Patent ↗
Granted: Sep 2, 1997
Filed: Jul 14, 1993
Inventors
Minoru Yamada
Shingo Kawamura
Assignee (at issue)
YKK 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.