Granted Patent
Utility
US 6,694,615 · App. 10/037,405
Method for manufacturing a welded hydraulic cylinder for reducing hoop stress
Inventor:
Roger D. Mickelson
Patented Case
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Granted: Feb 24, 2004
Filed: Dec 21, 2001
Inventor
Roger D. Mickelson
Assignee (at issue)
Case GmbH
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.