Granted Patent
Utility
US 6,712,913 · App. 10/358,330
Ferritic heat-resisting steel
Inventors:
Hiroyuki Hirata, Kazuhiro Ogawa
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Feb 5, 2003
Inventors
Hiroyuki Hirata
Kazuhiro Ogawa
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.