Granted Patent
Utility
US 6,237,835 · App. 09/515,001
Method and apparatus for backing up a friction stir weld joint
Inventors:
Edward Litwinski, Bert E. Syms
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Feb 29, 2000
Inventors
Edward Litwinski
Bert E. Syms
Assignee (at issue)
The Boeing Company
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.