Granted Patent
Utility
US 6,715,664 · App. 10/304,545
Friction stir welding method
Inventor:
Seiichiro Yamashita
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Nov 25, 2002
Inventor
Seiichiro Yamashita
Assignee (at issue)
KAWASAKI JUKOGYO KABUSHIKI KAISHA
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.