Granted Patent
Utility
US 4,831,229 · App. 06/938,976
High frequency resistance spot welding structure and method
Inventor:
John F. Farrow
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Dec 8, 1986
Inventor
John F. Farrow
Assignee (at issue)
Medar, Inc.
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.