Granted Patent
Utility
US 4,719,079 · App. 06/888,977
Continuous-cast low-carbon resulfurized free-cutting steel
Inventors:
Sakae Katayama, Tatsuya Imai, Norio Onodera, Yasushi Ishibashi
Patented Case
View Patent ↗
Granted: Jan 12, 1988
Filed: Jul 23, 1986
Inventors
Sakae Katayama
Tatsuya Imai
Norio Onodera
Yasushi Ishibashi
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.