Granted Patent
Utility
US 6,548,780 · App. 09/797,403
Techniques for resistance welding attachments to small pressure vessels
Inventor:
Arthur L. Lewis
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Feb 28, 2001
Inventor
Arthur L. Lewis
Assignee (at issue)
Manchester Tank & Equipment Co.
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.