Granted Patent
Utility
US 5,981,921 · App. 08/880,177
Method of magnetic pulse welding an end fitting to a driveshaft tube of a vehicular driveshaft
Inventor:
Boris A. Yablochnikov
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Jun 20, 1997
Inventor
Boris A. Yablochnikov
Assignee (at issue)
DANA LIMITED
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.