Granted Patent
Utility
US 4,587,174 · App. 06/564,958
Tungsten cermet
Inventors:
Hironori Yoshimura, Naohisa Ito, Kenichi Nishigaki, Katsunori Anzai
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Dec 23, 1983
Inventors
Hironori Yoshimura
Naohisa Ito
Kenichi Nishigaki
Katsunori Anzai
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.