Granted Patent
Utility
US 4,671,499 · App. 06/828,372
Tundish for continuous casting of free cutting steel
Inventors:
Kazuo Ishiyama, Masashi Yoshida, Isao Suzuki, Ichiro Kudo, Akira Otaki, Noboru Okuyama
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Feb 11, 1986
Inventors
Kazuo Ishiyama
Masashi Yoshida
Isao Suzuki
Ichiro Kudo
Akira Otaki
Noboru Okuyama
Assignee (at issue)
NIPPON STEEL 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.