Granted Patent
Utility
US 6,692,592 · App. 10/361,555
Method for manufacturing high chromium system seamless steel pipe
Inventors:
Shigeru Kidani, Koichi Ikeda, Toshiharu Abe
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Feb 11, 2003
Inventors
Shigeru Kidani
Koichi Ikeda
Toshiharu Abe
Assignee (at issue)
SUMITOMO METAL INDUSTRIES, LTD.
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.