Granted Patent
Utility
US 6,797,231 · App. 10/295,032
Steel for machine structural use
Inventors:
Naoki Matsui, Koji Watari, Takayuki Nishi, Toru Kato, Hitoshi Matsumoto, Hiroaki Tahira
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Nov 15, 2002
Inventors
Naoki Matsui
Koji Watari
Takayuki Nishi
Toru Kato
Hitoshi Matsumoto
Hiroaki Tahira
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.