Granted Patent
Utility
US 4,807,797 · App. 06/623,614
Method and apparatus for welding hollow elongated beams
Inventor:
John David West
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 21, 1984
Inventor
John David West
Assignee (at issue)
The Manitowoc Company, 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.