Granted Patent
Utility
US 6,068,178 · App. 09/105,026
Friction agitation joining method and friction agitation joining device
Inventor:
Hirozo Michisaka
Patented Case
View Patent ↗
Granted: May 30, 2000
Filed: Jun 25, 1998
Inventor
Hirozo Michisaka
Assignee (at issue)
Showa Aluminum Corp.
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.