Granted Patent
Utility
US 6,227,432 · App. 09/252,297
Friction agitation jointing method of metal workpieces
Inventors:
Masatoshi Enomoto, Seiji Tasaki, Naoki Nishikawa, Takenori Hashimoto
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Feb 18, 1999
Inventors
Masatoshi Enomoto
Seiji Tasaki
Naoki Nishikawa
Takenori Hashimoto
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.