Granted Patent
Utility
US 4,661,151 · App. 06/835,554
Treating agent for desulfurizing molten steels and method for treating molten steels
Inventors:
Koichi Endoh, Toshiyuki Kaneko, Hideo Yaoi, Seiji Aso, Yasuo Obana, Hideyuki Takahama
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Mar 3, 1986
Inventors
Koichi Endoh
Toshiyuki Kaneko
Hideo Yaoi
Seiji Aso
Yasuo Obana
Hideyuki Takahama
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.