Granted Patent
Utility
US 4,781,887 · App. 07/117,092
Production of steels containing low melting point metals
Inventor:
Akira Takahashi
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Nov 5, 1987
Inventor
Akira Takahashi
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.